UNITED STATES FILTER CORP
S-3/A, 1998-05-15
REFRIGERATION & SERVICE INDUSTRY MACHINERY
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              As filed with the Securities and Exchange Commission
   
                                 on May 14, 1998
                                               Registration No. 333-45981
    
        -----------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                       ----------------------------------
   
                               AMENDMENT NO. 4 TO

                                    FORM S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                        ---------------------------------
    
                        UNITED STATES FILTER CORPORATION
             (Exact name of registrant as specified in its charter)

DELAWARE                                  3589
(State or other jurisdiction        (Primary Standard Industrial
of incorporation or organization)   Classification Code Number)

33-0266015
(I.R.S. Employer
Identification No.)
                               40-004 COOK STREET
                          PALM DESERT, CALIFORNIA 92211
                                 (760) 340-0098
               (Address, including zip code, and telephone number,
        including area code, of registrant's principal executive offices)
                              -------------------

                               DAMIAN C. GEORGINO
                   EXECUTIVE VICE PRESIDENT, GENERAL COUNSEL
                             AND CORPORATE SECRETARY
                        UNITED STATES FILTER CORPORATION
                               40-004 COOK STREET
                          PALM DESERT, CALIFORNIA 92211
                                 (760) 340-0098
                     (Name, address, including zip code, and
          telephone number, including area code, of agent for service)
                              -------------------

                                    Copy to:
                                JANICE C. HARTMAN
                           KIRKPATRICK & LOCKHART LLP
                              1500 OLIVER BUILDING
                         PITTSBURGH, PENNSYLVANIA 15222
                                 (412) 355-6500



<PAGE>


APPROXIMATE  DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC:  From time to time
after this registration statement becomes effective.

      If the only  securities  being  registered  on this Form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. / /

      If any of  the  securities being registered on this Form are to be offered
on a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act
of 1933,  other than  securities  offered only in  connection  with  dividend or
interest reinvestment plans, check the following box. /X/

      If this Form is filed to register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. / /

      If this Form is a  post-effective  amendment filed pursuant to Rule 462(c)
under the Securities Act, please check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. / /

      If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /

                        ------------------------------



<PAGE>


===============================================================================
Information  contained  herein  is  subject  to  completion  or  amendment.  A
registration  statement  relating to these  securities has been filed with the
Securities and Exchange  Commission.  These securities may not be sold nor may
offers  to buy be  accepted  prior  to the  time  the  registration  statement
becomes  effective.  This Prospectus  shall not constitute an offer to sell or
the  solicitation  of an  offer  to buy nor  shall  there be any sale of these
securities  in any State in which such  offer,  solicitation  or sale would be
unlawful prior to registration or  qualification  under the securities laws of
any such State.
===============================================================================

   
SUBJECT TO COMPLETION DATED MAY 14, 1998
    


PROSPECTUS
             , 1998


                                5,815,450 SHARES

                        UNITED STATES FILTER CORPORATION

                                  COMMON STOCK
                           (PAR VALUE $.01 PER SHARE)

                              -------------------

      This  prospectus  provides  for the  offering by the Selling  Stockholders
named  herein (the  "Selling  Stockholders")  of up to an aggregate of 5,815,450
shares (the  "Shares") of the Common  Stock,  par value $.01 per share  ("Common
Stock"),  of United States Filter  Corporation (the "Company").  The Shares were
acquired by the Selling  Stockholders  named herein on January 16, 1998 pursuant
to the terms of a Merger  Agreement,  dated as of December 31,  1997,  among the
Company,  The Kinetics Group,  Inc.  ("Kinetics"),  U.S.  Filter/KG  Acquisition
Corp.,  The Bianco  Family 1991 Trust (the "Bianco  Trust"),  Dated  February 1,
1991, David J. Shimmon and BT Capital Partners,  Inc. (the "Merger  Agreement").
The Shares were issued in  consideration  of the  acquisition  by the Company of
Kinetics, effective as of December 31, 1997 (the "Merger").
See "Selling Stockholders."

      The  acquisition  of Kinetics was  accounted for as a pooling of interests
and accordingly the holders of an aggregate of 

<PAGE>

5,551,369  shares (the "Affiliate  Shares") may not sell,  transfer or otherwise
dispose of any Shares  prior to the date that the  Company  publishes  financial
results covering at least thirty days of combined  operations of the Company and
Kinetics.  In addition,  of the 5,815,450 shares, an aggregate of 290,194 Shares
(the "Escrow  Shares"),  277,569 of which are included in the Affiliate  Shares,
are held in escrow by PNC Bank, escrow agent,  under an Escrow Agreement entered
into pursuant to the Merger  Agreement.  The Escrow Shares are subject to claims
of the Company for indemnification under the Merger Agreement and, to the extent
not returned to the Company in satisfaction  of such claims for  indemnification
or  pending  the  resolution  of any  disputed  claims,  can be  expected  to be
delivered to the Selling  Stockholders  based upon their  respective  percentage
interests by December 31, 1998.

      Subject to the limitations  set forth above,  the Shares may be offered or
sold by or for the account of the Selling  Stockholders  from time to time or at
one time, on one or more  exchanges or  otherwise,  at prices and on terms to be
determined at the time of sale, to purchasers  directly or by or through brokers
or dealers, who may receive  compensation in the form of discounts,  commissions
or concessions.  The Selling Stockholders and any such brokers or dealers may be
deemed to be  "underwriters"  within the meaning of the United States Securities
Act of 1933, as amended (the "Securities  Act"), and any discounts,  concessions
and  commissions  received  by any such  brokers and dealers may be deemed to be
underwriting commissions or discounts under the Securities Act. The Company will
not receive any of the proceeds from any sale of the Shares offered hereby.  See
"Use of Proceeds," "Selling Stockholders" and "Plan of Distribution."

   
      The Common Stock is listed on the New York Stock Exchange (the "NYSE") and
traded under the symbol  "USF." The last reported sale price of the Common Stock
on the NYSE on May 13, 1998 was $33.50 per share.
    
                             ---------------------

      SEE "RISK FACTORS" BEGINNING ON PAGE 4 FOR CERTAIN CONSIDERATIONS RELEVANT
TO AN INVESTMENT IN THE COMMON STOCK.

                             ---------------------

         THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
          SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
         COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION OR
           ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY
              OR ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION
                    TO THE CONTRARY IS A CRIMINAL OFFENSE.

<PAGE>


                              AVAILABLE INFORMATION

      The  Company is subject to the  informational  requirements  of the United
States  Securities  Exchange Act of 1934 (the "Exchange  Act") and in accordance
therewith  files  periodic  reports,  proxy  solicitation  materials  and  other
information  with the United  States  Securities  and Exchange  Commission  (the
"Commission").  Such reports, proxy solicitation materials and other information
can be inspected and copied at the public reference facilities maintained by the
Commission at Judiciary Plaza, 450 Fifth Street,  N.W.,  Washington,  D.C. 20549
and at the  Commission's  Regional  Offices located at Seven World Trade Center,
Suite  1300,  New York,  New York 10048 and  Citicorp  Center  500 West  Madison
Street, Suite 1400, Chicago,  Illinois 60661-2511.  Copies of such materials can
be  obtained  from the Public  Reference  Section of the  Commission,  450 Fifth
Street,  N.W.,  Washington,  D.C.  20549,  at prescribed  rates.  The Commission
maintains a Web site that contains reports, proxy and information statements and
other  information  regarding  registrants  that  file  electronically  with the
Commission. Such reports, proxy and information statements and other information
may be found on the Commission's  site address,  http://www.sec.gov.  The Common
Stock is listed on the NYSE.  Such  reports,  proxy  solicitation  materials and
other  information  can also be  inspected  and  copied  at the NYSE at 20 Broad
Street, New York, New York 10005.


               INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
   
       The following  documents filed by the Company (File No. 1-10728) with the
Commission  pursuant to the Exchange Act are  incorporated  herein by reference:
the  Company's  Annual  Report on Form 10-K for the fiscal  year ended March 31,
1997; the Company's  Quarterly  Reports for the quarterly periods ended June 30,
1997 (as amended on Form 10-Q/A dated August 22,  1997),  September 30, 1997 and
December  31,  1997 (as amended on Forms  10-Q/A  dated May 12, 1998 and May 14,
1998);  the  Company's  Current  Reports on Form 8-K dated  October 28, 1996 (as
amended on a Forms 8-K/A dated December 19, 1996),  December 2, 1996, January 6,
1997, August 4, 1997,  September 17, 1997,  September 19, 1997, December 9, 1997
(as amended on Forms 8-K/A dated  February 6, 1998 and March 4, 1998),  December
31,  1997,  January 16, 1998 (as amended on Forms 8-K/A dated  February 6, 1998,
March 4, 1998,  May 12, 1998 and May 14, 1998),  February 9, 1998,  May 12, 1998
(as amended on Form 8-K dated May 14, 1998);  and the  description of the Common
Stock contained in the Company's Registration Statement on Form 8-A, as the same
may be amended.
    


                                       2
<PAGE>
   
     All documents and reports filed by the Company  pursuant to Sections 13(a),
13(c), 14 or 15(d)of the Exchange Act after the date of the initial registration
statement and prior to  effectiveness of this  registration  statement and after
the date of this Prospectus and prior to the termination of the offering made by
this  Prospectus  shall be deemed to be incorporated  by reference  herein.  Any
statement  contained  herein  or in a  document  incorporated  or  deemed  to be
incorporated  by reference  herein shall be deemed to be modified or  superseded
for purposes of this Prospectus to the extent that a statement  contained herein
or in any  subsequently  filed document which is or is deemed to be incorporated
by reference herein modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.
    

      The Company will provide to each person to whom a copy of this  Prospectus
is delivered, upon the written or oral request of such person, without charge, a
copy of any or all of the documents that are  incorporated  herein by reference,
other than exhibits to such  information  (unless such exhibits are specifically
incorporated by reference into such  documents).  Requests should be directed to
General  Counsel,  United States Filter  Corporation,  40-004 Cook Street,  Palm
Desert, California 92211 (telephone (760) 340-0098).


                                   THE COMPANY

      The Company is a leading global provider of industrial and municipal water
and wastewater treatment systems,  products and services, with an installed base
of systems  that the  Company  believes  is one of the  largest  worldwide.  The
Company  offers a  single-source  solution  to its  customers  through  what the
Company  believes is the industry's  broadest range of  cost-effective  systems,
products, services and proven technologies.  The Company markets a broad line of
waterworks  distribution  products and services.  In addition,  the Company also
sells, installs and services in the United States a wide range of products which
address  household water issues.  The Company has one of the industry's  largest
networks of sales and service and distribution  facilities through more than 600
locations  including  88  manufacturing  plants  in 33  countries.  The  Company
capitalizes on its large  installed  base,  extensive  distribution  network and
manufacturing  capabilities to provide  customers with ongoing local service and
maintenance.  The Company is a leading  provider of outsourced  water  services,
including the operation of water and  wastewater  treatment  systems at customer
sites.  In  addition,  the Company is actively  involved in the  development  of

                                       3
<PAGE>


privatization  initiatives for municipal water treatment  facilities  throughout
the world and,  specifically,  in the United  States,  Mexico  and  Canada.  The
Company also owns a significant  amount of  properties  with  appurtenant  water
rights in the Western and Southwestern  United States, a substantial  portion of
which are leased to agricultural tenants.


      The  Company's  principal  executive  offices  are  located at 40-004 Cook
Street,  Palm  Desert,  California  92211,  and its  telephone  number  is (760)
340-0098.  References  herein  to the  Company  refer to  United  States  Filter
Corporation and its subsidiaries, unless the context requires otherwise.


                                  RISK FACTORS

      Prospective  investors  should  consider  carefully the following  factors
relating to the business of the Company, together with the other information and
financial data included or incorporated by reference in this Prospectus,  before
acquiring the securities offered hereby.  Information  contained or incorporated
by reference in this Prospectus includes "forward-looking  statements" which can
be  identified by the use of  forward-looking  terminology  such as  "believes,"
"contemplates,"   "expects,"   "may,"  "will,"   "could,"   "should,"   "would,"
"anticipates" or "continue" or the negative thereof or other variations  thereon
or comparable  terminology.  No assurance  can be given that the future  results
covered  by the  forward-looking  statements  will be  achieved.  The  following
matters  constitute  cautionary  statements  identifying  important factors with
respect  to  such  forward-looking  statements,   including  certain  risks  and
uncertainties,  that could  cause  actual  results to vary  materially  from the
future results covered in such forward-looking statements.


RISK OF NON-CONSUMMATION OF THE CULLIGAN MERGER

      On  February  9,  1998,  the  Company  agreed to  acquire  Culligan  Water
Technologies,  Inc.  ("Culligan")  pursuant  to a Merger  Agreement  between the
Company,  a wholly owned  subsidiary of the Company and Culligan (the  "Culligan
Merger Agreement"). The merger ("Culligan Merger") is subject to approval by the
stockholders  of both  the  Company  and  Culligan.  The  Company  and  Culligan
currently anticipate holding special stockholders meetings in June 1998. Holders
of an aggregate of 28.5% of the outstanding shares of Culligan common stock have
agreed  to vote in  favor  of the  Culligan  Merger.  However,  there  can be no


                                       4
<PAGE>

assurance that the Culligan Merger will be consummated, or, if consummated, that
the Culligan  businesses  will be  integrated  successfully  into the  Company's
businesses or provide  profitable.  In the event of  termination of the Culligan
Merger Agreement because the Company's  stockholders do not approve the Culligan
Merger,  because the  Company's  Board of  Directors  modifies or changes in any
manner adverse to Culligan its  recommendation  to its  stockholders in favor of
the Culligan Merger or because the Company or its affiliates fail to perform the
Company's  obligations to use its reasonable best efforts to obtain governmental
and third party  approvals  and otherwise to take certain  actions  necessary to
consummate the Culligan  Merger,  the Company may be required to pay to Culligan
up to $47 million under the terms of the Culligan Merger Agreement.

      In  addition,  filings  with,  notifications  to  and  authorizations  and
approvals  of,  various  governmental  agencies,  both U.S. and  non-U.S.,  with
respect to the  transactions  contemplated  by the  Culligan  Merger  Agreement,
relating  primarily to antitrust,  foreign investment and securities law issues,
must be made and received  prior to  consummation  of the Culligan  Merger.  The
Company has received notice of early termination of the waiting period under the
Hart-Scott-Rodino  Antitrust  Improvements Act of 1976, as amended. The combined
enterprise  may be  required  to  divest  one or more of its  product  lines  or
operations, or agree to various operating restrictions,  before or after receipt
of stockholder  approval,  in order to obtain the necessary  authorizations  and
approvals of the Culligan Merger or to assure that  governmental  authorities do
not seek to enjoin  the  Culligan  Merger.  There can be no  assurance  that the
consummation of any such  divestitures  could be effected at a fair market price
or that  the  reinvestment  of the  proceeds  therefrom  would  produce  for the
combined  enterprise  operating profit at the same level as the divested product
lines or a commensurate  rate of return on the amount of its  investment.  There
also can be no  assurance  that any  operating  restrictions  imposed  would not
adversely affect the value of the combined  enterprise.  In addition,  obtaining
any  necessary  authorizations  and  approvals  may  result  in  delays  in  the
stockholder  meetings beyond June 1998. The Culligan Merger Agreement is subject
to termination if the Culligan Merger is not consummated by November 15, 1998.

      Culligan will have the right to terminate the Culligan Merger Agreement if
a governmental  authority enjoins the Culligan Merger; if the Culligan Merger is
not  consummated by November 15, 1998 and Culligan has not failed to perform its
obligations  under the Culligan Merger  Agreement;  if the Board of Directors of
the 



                                       5
<PAGE>

Company changes its  recommendation  to its  stockholders in a manner adverse to
Culligan in respect of the Culligan  Merger;  if the stockholders of Culligan or
the Company fail to approve the Culligan  Merger;  if the average of the closing
prices of the Common Stock for any period of 10 consecutive  trading days ending
on or after the sixth trading day prior to the date of  Culligan's  stockholders
meeting is less than $26.25; or if the Company materially breaches (and fails to
cure such breach) its obligations under the Culligan Merger Agreement.  However,
if Culligan  terminates the Culligan Merger  Agreement in respect of a competing
transaction, Culligan may be obligated to pay to the Company up to $47 million.


ACQUISITION STRATEGY


      In pursuit of its  strategic  objective  of becoming  the  leading  global
single-source  provider of water and wastewater  treatment systems and services,
the Company  has,  since 1991,  acquired  more than 125 United  States based and
international  businesses.  The Company plans to continue to pursue acquisitions
that expand the segments of the water and wastewater treatment and water-related
industries in which it participates,  complement its  technologies,  products or
services,  broaden its customer base and  geographic  areas served and/or expand
its  global  distribution   network,  as  well  as  acquisitions  which  provide
opportunities to further and implement the Company's  one-stop-shop  approach in
terms of technology, distribution or service. The Company's acquisition strategy
entails  the  potential  risks  inherent  in  assessing  the  value,  strengths,
weaknesses,  contingent  or other  liabilities  and potential  profitability  of
acquisition  candidates and in integrating the operations of acquired companies.
In  addition,  the  Company's  acquisition  of Memtec  Limited was  accomplished
through an  unsolicited  tender  offer,  and the  Company  could make other such
acquisitions.  The level of risk associated with such  acquisitions is generally
greater  because  frequently  they are  accomplished,  as was the case  with the
acquisition of Memtec,  without the customary  representations  or due diligence
typical of  negotiated  transactions.  Although the Company  generally  has been
successful in pursuing acquisitions,  there can be no assurance that acquisition
opportunities  will continue to be available,  that the Company will have access
to the capital required to finance potential acquisitions, that the Company will
continue to acquire  businesses or that any business acquired will be integrated
successfully or prove profitable.


                                       6
<PAGE>

INTERNATIONAL TRANSACTIONS

      The Company has made and expects it will continue to make acquisitions and
expects to obtain contracts in markets outside the United States. In addition, a
substantial  portion of the business of Culligan includes non-U.S.  sales. While
these activities may provide  important  opportunities  for the Company to offer
its products and services internationally, they also entail the risks associated
with  conducting  business  internationally,  including  the  risk  of  currency
fluctuations,  slower  payment of invoices,  the lack in some  jurisdictions  of
well-developed legal systems, nationalization and possible social, political and
economic instability.  In particular,  the Company has significant operations in
Asia  which  have been and may in the future be  adversely  affected  by current
economic  conditions  in that  region.  While the full  impact of this  economic
instability cannot be predicted,  it could have a material adverse effect on the
Company's revenues and profitability.


RELIANCE ON KEY PERSONNEL

      The  operations of the Company are  dependent on the continued  efforts of
senior management,  in particular Richard J. Heckmann, the Company's Chairman of
the Board,  President and Chief Executive Officer. The Company is considering an
employment  agreement for Mr.  Heckmann,  who does not  currently  have one. The
Company is also  considering  employment  agreements for other members of senior
management,  most of whom do not currently  have such  agreements,  although the
names of such members have yet to be determined.  There can be no assurance that
the Company will enter into  employment  agreements with Mr. Heckmann or members
of senior  management.  Should any of the Company's senior managers be unable or
choose not to continue in their present roles, the Company's  prospects could be
adversely affected.


PROFITABILITY OF FIXED PRICE CONTRACTS

      A significant  portion of the Company's revenues are generated under fixed
price  contracts.  To the extent that  original cost  estimates are  inaccurate,
scheduled  deliveries  are  delayed or progress  under a contract  is  otherwise
impeded, revenue recognition and profitability from a particular contract may be
adversely affected. The Company routinely records upward or downward adjustments
with  respect to fixed price  contracts  due to changes in estimates of costs to
complete  such  contracts.  There  can  be no  assurance  that  future  downward
adjustments will not be material.

                                       7
<PAGE>

CYCLICALITY, SEASONALITY AND POSSIBLE EARNINGS FLUCTUATIONS

      The sale of capital  equipment  within  the water  treatment  industry  is
cyclical and influenced by various economic factors including interest rates and
general  fluctuations  of the  business  cycle.  A  significant  portion  of the
Company's  revenues are derived from capital equipment sales.  While the Company
sells  capital  equipment  to  customers  in  diverse  industries  and in global
markets,  cyclicality  of capital  equipment  sales and  instability  of general
economic conditions, including those currently unfolding in Asian markets, could
have a material adverse effect on the Company's revenues and profitability.

      The sale of water and  wastewater  distribution  equipment and supplies is
also cyclical and  influenced by various  economic  factors  including  interest
rates, land development and housing construction  industry cycles. Sales of such
equipment  and supplies are also  subject to seasonal  fluctuation  in temperate
climates.  The sale of water and wastewater  distribution equipment and supplies
is  a  significant   component  of  the  Company's  business.   Cyclicality  and
seasonality  of water and wastewater  distribution  equipment and supplies sales
could  have  a  material   adverse   effect  on  the   Company's   revenues  and
profitability.

      The  Company's   high-purity   process   piping  systems  have  been  sold
principally  to  companies  in  the  semiconductor  and,  to  a  lesser  extent,
pharmaceutical  and  biotechnology  industries,  and sales of those  systems are
critically dependent on these industries. The success of customers and potential
customers  for  high-purity   process  piping  systems  is  linked  to  economic
conditions  in these  respective  industries,  which in turn are each subject to
intense  competitive  pressure and are affected by overall economic  conditions.
The semiconductor  industry in particular has historically been, and will likely
continue to be,  cyclical in nature and  vulnerable to general  downturns in the
economy.   The  semiconductor  and  pharmaceutical   industries  also  represent
significant  markets for the Company's water and wastewater  treatment  systems.
Downturns  in these  industries  could  have a  material  adverse  effect on the
Company's revenues and profitability.

      Operating results from the sale of high-purity process piping systems also
can be expected to  fluctuate  significantly  as a result of the limited pool of
existing and potential customers for these systems, the timing of new contracts,
possible  



                                       8
<PAGE>

deferrals  or  cancellations   of  existing   contracts  and  the  evolving  and
unpredictable nature of the markets for high-purity process piping systems.

      As a result of these and other factors,  the Company's  operating  results
may be subject to  quarterly or annual  fluctuations.  There can be no assurance
that at any given time the Company's operating results will meet or exceed stock
market  analysts'  expectations,  in which event the market  price of the Common
Stock could be adversely affected.

POTENTIAL ENVIRONMENTAL RISKS

      The Company's business and products may be significantly influenced by the
constantly  changing body of environmental  laws and regulations,  which require
that certain environmental standards be met and impose liability for the failure
to comply with such  standards.  The Company is also  subject to inherent  risks
associated with  environmental  conditions at facilities owned, and the state of
compliance with environmental laws, by businesses acquired by the Company. While
the  Company  endeavors  at each of its  facilities  to assure  compliance  with
environmental laws and regulations, there can be no assurance that the Company's
operations or  activities,  or historical  operations by others at the Company's
locations, will not result in cleanup obligations, civil or criminal enforcement
actions or private  actions  that  could have a material  adverse  effect on the
Company.

      In that regard, at a Connecticut ion exchange resin regeneration  facility
(the "South  Windsor  Facility")  operated by a wholly owned  subsidiary  of the
Company  (the "South  Windsor  Subsidiary"),  acquired by the Company in October
1995  from  Anjou  International  Company  ("Anjou"),  U.S.  federal  and  state
environmental  regulatory  authorities  have issued certain notices of violation
alleging multiple violations of applicable wastewater  pretreatment standards. A
grand jury investigation  concerning these conditions also is pending. The South
Windsor  Subsidiary has reached a tentative  agreement with the U.S.  Attorney's
Office and the U.S.  Environmental  Protection  Agency  ("USEPA")  to settle all
agency claims and investigations relating to this matter by pleading guilty to a
single  violation  of the Federal  Water  Pollution  Control  Act.  The proposed
settlement includes a payment of $1.36 million,  including a criminal penalty of
approximately $1.0 million,  and annual  environmental  compliance audits at the
South Windsor Facility for five years. The Company believes that this settlement
will conclude this matter in its  entirety;  however,  there can be no 



                                       9
<PAGE>

assurance that the proposed settlement will become final, and it is not expected
that it would include a formal  release of all  liabilities  in this regard.  In
connection with this proposed settlement, representatives of the Company and the
USEPA's  Office  of Grants  and  Debarment  have  discussed  the  South  Windsor
Facility's  debarment from participation in government  contracts.  Based on its
discussions  with the USEPA,  the Company  believes that the USEPA will lift any
such debarment immediately after the Company and the USEPA agree to the proposed
settlement. The loss of revenue from a debarment, regardless of its duration, is
not  expected  to be  material  to  the  Company.  Based  upon  the  anticipated
settlement,  the Company  does not believe that this matter will have a material
adverse  effect on the Company.  In addition,  the Company has certain rights of
indemnification  from Anjou which may be available with respect to these matters
pursuant  to the laws of the state of New York or the Stock  Purchase  Agreement
dated as of August 30, 1995 among the Company, Anjou and Polymetrics, Inc.

      With  respect  to a former  California  ion  exchange  resin  regeneration
facility (the "El Cajon Facility")  operated by a wholly owned subsidiary of the
Company (the "El Cajon  Subsidiary"),  the San Diego county district attorney is
investigating  a  hydrochloric  acid  spill  that  occurred  in early  1997.  In
connection  with this  incident,  the  Company  and the  office of the  district
attorney have reached a proposed  settlement  (subject to final  approval of the
court)  whereby the Company has agreed to a civil  violation  of the  California
Health and  Safety  Code and has paid a $140,000  fine,  which  includes a civil
penalty of $25,000.  Pursuant to the terms of the settlement,  the office of the
district  attorney  has agreed  that it will not  subject  the  Company  (or its
subsidiaries  and affiliates) to further civil or criminal  prosecution for this
matter.

      In  addition  to the  foregoing,  the  Company's  activities  as owner and
operator of certain  hazardous  waste  treatment  and  recovery  facilities  are
subject to stringent laws and  regulations  and compliance  reviews.  Failure of
these  facilities to comply with those  regulations  could result in substantial
fines and the suspension or revocation of the facility's hazardous waste permit.
The Company  serves as contract  operator of various  municipal  and  industrial
wastewater  collection  and treatment  facilities,  which were developed and are
owned by governmental or private entities. The Company and Culligan also operate
other  facilities,  including  service  deionization  centers and  manufacturing
facilities,  that discharge  wastewater in connection



                                       10
<PAGE>

with  routine  operations.   Under  certain  service  contracts  and  applicable
environmental laws, the Company as operator of such facilities may incur certain
liabilities in the event those facilities  experience  malfunctions or discharge
wastewater  which  does  not  meet  applicable   permit  limits  and  regulatory
requirements.  In some cases,  the potential for such  liabilities  depends upon
design or  operational  conditions  over which the Company has limited,  if any,
control. In other matters, the Company has been notified by the USEPA that it is
a potentially responsible party under the Comprehensive  Environmental Response,
Compensation, and Liability Act of 1980 ("CERCLA") at certain sites to which the
Company or its  predecessors  allegedly  sent waste in the past.  It is possible
that the Company  could  receive  other such  notices  under CERCLA or analogous
state  laws in the  future.  Based on sites  which  are  currently  known to the
Company  that may require  remediation,  the Company  does not believe  that its
liability,  if any, relating to such sites will be material.  However, there can
be no assurance  that such matters  will not be material.  In addition,  to some
extent, the liabilities and risks imposed by environmental laws on the Company's
customers may adversely  impact demand for certain of the Company's  products or
services or impose  greater  liabilities  and risks on the Company,  which could
also have an adverse effect on the Company's competitive and financial position.

   
     In 1995, Culligan purchased an equity interest in Anvil Holdings, Inc. As a
result of this transaction,  Culligan assumed certain environmental  liabilities
associated with soil and groundwater contamination at Anvil Knitwear's Asheville
Dyeing and Finishing  Plant (the "Plant") in Swannanoa,  North  Carolina.  Since
1990,  Culligan has  delineated and monitored the  contamination  pursuant to an
Administrative  Consent Order entered into with the North Carolina Department of
Environment,  Health  and  Natural  Resources  related  to  the  closure  of  an
underground  storage tank at the site.  Groundwater  testing at the Plant and at
two adjoining  properties has shown levels of a cleaning  solvent believed to be
from the Plant above action  levels under state  guidelines.  Culligan has begun
remediation of the contamination. Culligan currently estimates that the costs of
future site  remediation  will range from up to $1.0 million to $1.8 million and
that it has sufficient reserves for the site cleanup.  Culligan anticipates that
the potential costs of further monitoring and corrective measures to address the
groundwater  problem  under  applicable  laws will not have a  material  adverse
effect on the  financial  position or the  results of  operations  of  Culligan,
however,  because  the  full  extent  of  the  required  cleanup  has  not  been
determined,  there can be no assurance that this matter will not have a material
adverse effect on Culligan's  financial position or the results of operations of
Culligan.
    

                                       11
<PAGE>

      Certain of the Company's and Culligan's  facilities contain or in the past
contained  underground  storage  tanks which may have cause soil or  groundwater
contamination.  At one formerly owned site,  Culligan is investigating,  and has
taken certain  actions to correct,  contamination  that may have resulted from a
former underground  storage tank. Based on the amount of contamination  believed
to have been present when the tank was removed, and the probability that some of
the  contamination  may have  originated  from  nearby  properties,  the Company
believes,  although there can be no assurance,  that this matter will not have a
material adverse effect on the combined companies' financial position or results
of operations.


COMPETITION

      All of the markets in which the Company  competes are highly  competitive,
and most are fragmented,  with numerous regional and local  participants.  There
are  competitors  of the  Company  in  certain  markets  that are  divisions  or
subsidiaries  of companies that have  significantly  greater  resources than the
Company.  The Company's process water treatment  business competes in the United
States  and  internationally  principally  on the basis of product  quality  and
specifications,  technology, reliability, price, customized design and technical
qualifications,  reputation  and  prompt  availability  of  local  service.  The
Company's  wastewater  treatment  business  competes  in the  United  States and
internationally  largely on the basis of the same  factors,  except that pricing
considerations  can  be  predominant  among  competitors  that  have  sufficient
technical  qualifications,  particularly in the municipal  contract bid process.
The Company's  filtration and separation  business competes in the United States
and  internationally  principally  on the basis of price,  technical  expertise,
product  quality and  responsiveness  to customer needs,  including  service and
technical  support.  The  Company's  industrial  products and services  business
competes in the United States and  internationally  principally  on the basis of
quality,  service and price.  In  connection  with the  marketing of  waterworks
distribution  equipment and supplies, the Company competes not only with a large
number of independent  wholesalers and with other distribution chains similar to
the Company,  but also with  manufacturers  who sell directly to customers.  The
principal  methods of  competition  for the  Company's  waterworks  distribution
business include prompt local service capability, product knowledge by the sales
force and service branch management,  and price. The Company's consumer products
business competes with companies with national distribution networks, 



                                       12
<PAGE>

businesses  with  regional  scope,  and  local  product  assemblers  or  service
companies,  as well as retail  outlets.  The  Company  believes  that  there are
thousands  of  participants  in the  residential  water  business.  The consumer
products  business,  which upon consummation of the Culligan Merger will include
Culligan's current residential operations,  competes principally on the basis of
price,  product  quality  and  "taste,"  service,   distribution   capabilities,
geographic  presence and  reputation.  Competitive  pressures,  including  those
described  above, and other factors could cause the Company to lose market share
or could  result in  significant  price  erosion,  either of which  could have a
material  adverse  effect  upon the  Company's  financial  position,  results of
operations and cash flows.


POTENTIAL RISKS RELATED TO WATER RIGHTS AND WATER TRANSFERS

      The Company recently  acquired more than 47,000 acres of agricultural land
(the "Properties"),  situated in the Southwestern United States, the substantial
majority  of which are in Imperial  County,  California  (the "IID  Properties")
located within the Imperial Irrigation  District (the "IID").  Substantially all
of the  Properties  are currently  leased to third party  agricultural  tenants,
including  prior owners of the Properties.  The Company  acquired the Properties
with appurtenant  water rights,  and is actively  seeking to acquire  additional
properties with water rights,  primarily in the  Southwestern and Western United
States.  The Company may seek in the future to transfer  water  attributable  to
water rights appurtenant to the Properties, particularly the IID Properties (the
"IID  Water").  However,  since the IID holds  title to all of the water  rights
within the IID in trust for the landowners, the IID would control the timing and
terms of any  transfers of IID Water by the  Company.  The  circumstances  under
which transfers of water can be made and the  profitability of any transfers are
subject to significant  uncertainties,  including  hydrologic  risks of variable
water  supplies,  risks  presented by  allocations  of water under  existing and
prospective  priorities,  and risks of adverse changes to or  interpretations of
U.S. federal, state and local laws,  regulations and policies.  Transfers of IID
Water  attributable to water rights  appurtenant to the IID Properties (the "IID
Water Rights") are subject to additional uncertainties.  Allocations of Colorado
River water,  which is the source of all water deliveries to the IID Properties,
are subject to  limitations  under complex  international  treaties,  interstate
compacts,  U.S.  federal  and  state  laws  and  regulations,   and  contractual
arrangements  and, in times of drought,  water  deliveries could be curtailed by
the U.S.  government.  Further,  any  transfers  of IID Water would  require 


                                       13
<PAGE>

the approval of the U.S.  Secretary  of the  Interior.  Even if a transfer  were
approved, other California water districts and users could assert claims adverse
to the IID Water  Rights,  including  but not limited to claims that the IID has
failed to satisfy U.S.  federal law and California  constitutional  requirements
that IID Water must be put to reasonable and beneficial  use. A finding that the
IID's water use is unreasonable or nonbeneficial could adversely impact title to
the IID Water Rights and the ability to transfer IID Water. Water transferred by
the IID to  metropolitan  areas  of  Southern  California,  such  as San  Diego,
currently  would be  transported  through  aqueducts  owned or controlled by the
Metropolitan  Water  District,  a  quasi-governmental  agency (the  "MWD").  The
transportation  cost for any transfer of IID Water and the volume of water which
the MWD can be required to transport at any time are subject to California  laws
of uncertain application, some aspects of which are currently in litigation. The
uncertainties  associated with water rights could have a material adverse effect
on the Company's future profitability.


TECHNOLOGICAL AND REGULATORY RISKS

   
      Portions of the water and wastewater  treatment business are characterized
by changing technology,  competitively  imposed process standards and regulatory
requirements, each of which influences the demand for the Company's products and
services. Changes in regulatory or industrial requirements may render certain of
the  Company's  treatment  products and  processes  obsolete.  Acceptance of new
products  may also be affected by the  adoption  of new  government  regulations
requiring  stricter  standards.  The Company's ability to anticipate  changes in
technological and regulatory standards and to develop successfully and introduce
new and enhanced products on a timely basis will be a significant  factor in the
Company's ability to grow and to remain  competitive.  There can be no assurance
that the Company will be able to achieve the technological  advances that may be
necessary for it to remain  competitive or that certain of its products will not
become  obsolete.  In  addition,  the Company is subject to the risks  generally
associated with new product  introductions and  applications,  including lack of
market  acceptance,  delays in  development  or failure of  products  to operate
properly.  The market  growth  potential  of acquired  in-process  research  and
development  is  subject  to  certain  risks,  including  costs to  develop  and
commercialize such products,  the cost and feasibility of production of products
utilizing the applicable  technologies,  introduction of competing technologies,
and market acceptance of the products and technologies involved.
    

      There  can be no  assurance  that the  Company's  existing  or any  future
trademarks or patents will be enforceable or will provide substantial protection
from competition or be of commercial  benefit to the Company.  In addition,  the
laws of certain  non-



                                       14
<PAGE>

United States countries may not protect proprietary rights to the same extent as
do the laws of the  United  States.  Successful  challenges  to  certain  of the
Company's   patents  or  trademarks  could   materially   adversely  affect  its
competitive and financial position.

MUNICIPAL WATER AND WASTEWATER BUSINESS

      A  significant  percentage  of the  Company's  revenues  is  derived  from
municipal  customers.  While  municipalities  represent an important part of the
water and wastewater  treatment  industry,  contractor  selection  processes and
funding for projects in the municipal sector entail certain additional risks not
typically encountered with industrial customers.  Competition for selection of a
municipal contractor typically occurs through a formal bidding process which can
require the  commitment  of  resources  and greater  lead times than  industrial
projects.  In  addition,  this  segment is dependent  upon the  availability  of
funding at the local level,  which may be the subject of increasing  pressure as
local  governments  are  expected to bear a greater  share of the cost of public
services.

YEAR 2000 RISKS

      The Year 2000  issue  concerns  the  potential  exposures  related  to the
automated generation of business and financial misinformation resulting from the
application  of  computer  programs  which have been  written  using two digits,
rather than four, to define the applicable year of business  transactions.  Most
of the Company's  operating  systems with Year 2000 issues have been modified to
address  those  issues;   accordingly,   management   does  not  anticipate  any
significant costs, problems or uncertainties  associated with becoming Year 2000
compliant.  The Company is currently  developing a plan  intended to assure that
its other  internal  operating  systems  with Year 2000 issues are modified on a
timely  basis.  Suppliers,  customers  and  creditors  of the Company  also face
similar Year 2000 issues. A failure to successfully  address the Year 2000 issue
could have a material  adverse  effect on the  Company's  business or results of
operations.

SHARES ELIGIBLE FOR FUTURE SALE
   
      The market price of the Common  Stock could be  adversely  affected by the
availability  for  public  sale of  shares  held on March 31,  1998 by  security
holders of the  Company,  including:  (i) up to  3,646,783  shares  which may be
delivered by Laidlaw Inc. 


                                       15
<PAGE>

or its affiliates ("Laidlaw"),  at Laidlaw's option in lieu of cash, at maturity
pursuant  to the terms of 5-3/4%  Exchangeable  Notes due 2000 of  Laidlaw  (the
amount of shares or cash delivered or paid to be dependent within certain limits
upon the value of the Common  Stock at  maturity),  or sold from time to time in
accordance  with Rule 144(k) under the  Securities  Act; (ii)  7,636,364  shares
issuable upon conversion of the Company's 6% Convertible  Subordinated Notes due
2005 at a conversion price of $18.33 per share of Common Stock; (iii) 10,481,013
shares issuable upon conversion of the Company's 4-1/2% Convertible Subordinated
Notes due 2001 at a conversion  price of $39.50 per share of Common Stock;  (iv)
1,200,000  shares  issuable  upon  exercise of warrants,  600,000 at an exercise
price of $50.00 per share and 600,000 at an exercise  price of $60.00 per share,
in each case  expiring on September 17, 2007 and  exercisable  at any time after
the first sale of water from water rights  appurtenant  to the  Properties  (the
"Warrants");   and  (v)  8,482,926  outstanding  shares  which  are  subject  to
agreements  pursuant to which the  holders  have  certain  rights to request the
Company to register the sale of such holders'  Common Stock under the Securities
Act and/or,  subject to certain  conditions,  to include certain  percentages of
such shares in other registration statements filed by the Company, of which such
rights as to 8,000,000  shares are not  exercisable  until February 17, 2000. In
addition, the Company has registered for sale under the Securities Act 2,903,207
shares which may be issuable by the Company from time to time in connection with
acquisitions  of businesses or assets from third parties.  Upon  consummation of
the  Culligan  Merger,  approximately 46,343,475 shares to be issued  pursuant
thereto  (assuming  the  Average  Share  price is  $33.50)   will be subject to
agreements  pursuant to which certain  stockholders  will have certain rights to
request the Company to register the sale of such shares under the Securities Act
and/or,  subject to certain  conditions,  to include certain percentages of such
shares in other registration  statements filed by the Company. See "Risk Factors
Acquisition Strategy."
    



                                       16
<PAGE>

   
                              RECENT DEVELOPMENTS


       The  Company  has  entered  into an  agreement  to issue $900  million of
unsecured  redeemable  or  remarketable  securities  to qualified  institutional
buyers (as  defined in Rule 144A of the  Securities  Act) to  refinance existing
indebtedness  under  the  Company's  Senior  Credit  Facility  and  for  general
corporate purposes.  The proposed issuance of such securities is not expected to
have a material impact on the Company's financial position or its future results
of operations. The securities offered will not be, and have not been, registered
under the  Securities  Act and may not be offered  or sold in the United  States
absent registration or applicable exemption from the registration requirements.
    


                                 USE OF PROCEEDS

      The Selling  Stockholders  will receive all of the net  proceeds  from any
sale of the Shares offered  hereby,  and none of such proceeds will be available
for use by the Company or otherwise for the Company's benefit.


                              SELLING STOCKHOLDERS

      The following table sets forth the names of the Selling Stockholders,  the
total number of Shares owned,  including separately the number of shares subject
to the Escrow Agreement and the number of shares as adjusted to reflect the sale
of the Shares by the  Selling  Stockholders.  Each of the  Selling  Stockholders
acquired the Shares on January 16,  1998,  and the  respective  number of shares
indicated as to each Selling  Stockholder  constitutes  less than one percent of
the shares of Common Stock  outstanding as of such date, except as to The Bianco
Trust,  David J. Shimmon and BT Capital Partners Inc., which owned  beneficially
2.2%, 1.9% and 1.1% as of such date.

<TABLE>
<CAPTION>
                                                                     Shares
     Name of           Shares         Shares        Maximum       Beneficially
     Selling        Beneficially    Subject to   Shares to be       Owned As
   Stockholder         Owned          Escrow         Sold           Adjusted

<S>                  <C>             <C>           <C>                 <C>     
The Bianco           2,314,995       115,750       2,314,995           --
Family 1991
Trust, dated
February 1, 1991

David J. Shimmon     2,052,920       102,646       2,052,920           --

BT Capital           1,183,454        59,173       1,183,454           --
Partners Inc.

Churchill ESOP         92,600         4,630         92,600             --
Capital Partners


D&S Partners         50,958(1)        1,966        50,958(1)           --



                                       17
<PAGE>


                                                                     Shares
     Name of           Shares         Shares        Maximum       Beneficially
     Selling        Beneficially    Subject to   Shares to be       Owned As
   Stockholder         Owned          Escrow         Sold           Adjusted


Silicon Valley         38,476         1,924         38,476             --
Bancshares

L.H. Friend,           36,921         1,847         36,921             --
Weinress,
Frankson &
Presson, Inc.

Gregory Presson        26,665         1,334         26,665             --


Christopher            18,461          924          18,461             --
Halloran

Total               5,815,450(1)     290,194     5,815,450(1)          --
- ----------------
(1) Includes  11,647  shares of Common  Stock which the  holder has the right to
    acquire pursuant to options at an exercise price of $12.02 per share, giving
    effect to the conversion in accordance with the Merger  Agreement of options
    to purchase shares of the Common Stock of Kinetics.

</TABLE>


      Pursuant to the Merger  Agreement,  the Company  acquired from the Selling
Stockholders  all of the  issued  and  outstanding  shares of  capital  stock of
Kinetics. Other than their equity holdings in Kinetics, the Selling Stockholders
do not have, and within the past three years did not have, any position,  office
or other material  relationship  with the Company or any of its  predecessors or
affiliates,  except that:  (i) William A.  Bianco,  Jr., a Trustee of the Bianco
Trust,  was the  founder of Kinetics in 1973 and served as Chairman of the Board
from 1980 until the consummation of the Merger and as Chief Executive Officer of
Kinetics  from 1973 through March 1997;  (ii) Marie R. Bianco,  a Trustee of the
Bianco Trust, served as Executive Vice President and a Director of Kinetics from
1989 until the consummation of the Merger;  (iii) David J. Shimmon has served as
President/Chief  Operating  Officer of the  Company's  Industrial  Products  and
Services  Group since March 1998, as Chief  Executive  Officer of Kinetics since
March 1997, as President  and Director of Kinetics  since October 1990, as Chief
Financial Officer of Kinetics from 1991 until the consummation of the Merger and
as Executive  Vice  President of Kinetics  from October 1990 through March 1996;
(iv) 



                                       18
<PAGE>

BT Capital  Partners  ("BT")  purchased  2,250,000  shares of Series A Preferred
Stock  from  Kinetics  in  June  1995  and  loaned  Kinetics  $10,000,000  in  a
subordinated debt offering in June 1997 which was repaid by the Company upon the
consummation of the Merger;  (v) Martin M. Jelenko,  a consultant or employee of
affiliates  of BT since 1992,  served as a Director  of Kinetics  from June 1995
until the consummation of the Merger; and (vi) Jeffrey L. Ott, who has served in
several  capacities  at  affiliates  of BT since  1988,  served as a Director of
Kinetics from December 1996 until the consummation of the Merger.


                              PLAN OF DISTRIBUTION

      The  Shares  offered  hereby  may be sold  from time to time by or for the
account of the  Selling  Stockholders  on one or more  exchanges  or  otherwise;
directly to  purchasers  in negotiated  transactions;  by or through  brokers or
dealers in ordinary brokerage  transactions or transactions in which a broker or
dealer  solicits  purchasers;  in block trades in which  brokers or dealers will
attempt  to sell  Shares as agent but may  position  and resell a portion of the
block as principal;  in  transactions  in which a broker or dealer  purchases as
principal for resale for its own account; or in any combination of the foregoing
methods.  Shares may be sold at a fixed offering price, which may be changed, at
the  prevailing  market  price at the time of sale,  at prices  related  to such
prevailing market price or at negotiated prices.  Brokers or dealers may arrange
for others to participate in any such  transaction and may receive  compensation
in the form of  discounts,  commissions  or  concessions  payable by the Company
and/or the purchasers of Shares. If required at the time that a particular offer
of Shares is made,  a  supplement  to this  Prospectus  will be  delivered  that
describes any material arrangements for the distribution of Shares and the terms
of the offering,  including,  without limitation, any discounts,  commissions or
concessions  and  other  items   constituting   compensation  from  the  Selling
Stockholders  or  otherwise.  The Company may agree to  indemnify  participating
brokers or dealers  against  certain civil  liabilities,  including  liabilities
under the Securities Act. The Company and the Selling Stockholders are obligated
to indemnify  each other  against  certain civil  liabilities  arising under the
Securities Act.

      The  Selling  Stockholders  may not sell the Shares in the  public  market
unless  they  do  so by or  through  Donaldson,  Lufkin  &  Jenrette  Securities
Corporation,  Salomon  Smith Barney Inc.,  Deutsche  Morgan  Grenfell or BT Alex
Brown or another nationally 


                                       19
<PAGE>

recognized investment banking firm satisfactory to the Company in its reasonable
discretion,  and,  further,  the Selling  Stockholders are obligated to sell the
Shares in the  public  market in an orderly  fashion  as will not be  materially
disruptive to the market for the Common Stock.

      The Selling  Stockholders and any such brokers or dealers may be deemed to
be  "underwriters"  within the meaning of the Securities Act, in which event any
discounts,  commissions or  concessions  received by such brokers or dealers and
any profit on the resale of the Shares  purchased by such brokers or dealers may
be deemed to be underwriting commissions or discounts under the Securities Act.

      The Company has informed the Selling  Stockholders  that the provisions of
Regulation  M under the  Exchange Act may apply to their sales of Shares and has
furnished the Selling  Stockholders with a copy of that regulation.  The Company
also has advised the Selling  Stockholders  of the requirement for delivery of a
prospectus in connection with any sale of the Shares.

      Any Shares covered by this  Prospectus  which qualify for sale pursuant to
Rule 144  under  the  Securities  Act may be sold  under  Rule 144  rather  than
pursuant to this Prospectus. There is no assurance that the Selling Stockholders
will sell any or all of the  Shares.  The  Selling  Stockholders  may  transfer,
devise or gift such Shares by other means not described herein.

      The  Company  will pay all of the  expenses  incurred in  connection  with
registration of the Shares,  including,  without  limitation,  all registration,
printing,  qualification  and filing fees and fees and  disbursements of counsel
for the Company ("Registration  Expenses").  All costs and expenses,  other than
Registration  Expenses,  including without limitation,  underwriting  discounts,
selling commissions and stock transfer taxes,  applicable to registration of the
Shares will be paid by the Selling Stockholders.


                          DESCRIPTION OF CAPITAL STOCK

GENERAL

      As of March 31,  1998,  the Company was  authorized  to issue  300,000,000
shares of Common Stock,  par value $.01 per share, of which  108,462,296  shares
were issued and outstanding,  and 3,000,000 shares of preferred stock, par value
$.10 per share,  of 



                                       20
<PAGE>

which none were issued and outstanding.  Of the unissued shares of Common Stock,
7,636,364  shares were reserved for issuance upon conversion of the Company's 6%
Convertible  Subordinated  Notes due 2005,  10,481,013  shares were reserved for
issuance upon conversion of the Company's 4-1/2% Convertible  Subordinated Notes
due 2001,  1,200,000  shares were  reserved  for issuance  upon  exercise of the
Warrants  expiring  September 17, 2007 and an aggregate of 7,647,059 shares were
reserved for issuance upon exercise of options  either  outstanding or available
for grant.

COMMON STOCK

      The holders of Common  Stock are  entitled to one vote for each share held
of record by them on all  matters  to be voted on by  stockholders.  There is no
cumulative  voting with respect to the election of directors;  thus, the holders
of shares having more than 50% of the  Company's  voting power  (including  both
common and voting preferred shares, if any) voting for the election of directors
can elect all of the  directors.  The  holders of Common  Stock are  entitled to
receive  dividends  when,  as and if declared by the Board of  Directors  out of
funds  legally  available  therefor,  subject to the prior  rights of  preferred
stockholders.  In the event of  liquidation,  dissolution  or  winding up of the
Company's affairs,  the holders of Common Stock are entitled to share ratably in
all  assets  remaining  available  for  distribution  to them  after  payment of
liabilities and after provision has been made for each class of stock, including
any  preferred  stock,  that has  preference  over the Common  Stock.  Except as
described  below  under  "Stock  Purchase  Rights,"  holders of shares of Common
Stock, as such, have no conversion, preemptive or other subscription rights, and
there are no  redemption  or sinking fund  provisions  applicable  to the Common
Stock.

      The Company  currently intends to retain earnings to provide funds for the
operation  and  expansion of its business and  accordingly  does not  anticipate
paying cash dividends on the Common Stock in the foreseeable future. Any payment
of cash  dividends  on the  Common  Stock in the  future  will  depend  upon the
Company's financial  condition,  earnings,  capital  requirements and such other
factors as the Board of Directors deems relevant.

PREFERRED STOCK

      Shares of preferred stock may be issued without stockholder approval.  The
Board of Directors is  authorized to issue such shares in one or more series and
to fix the rights,  preferences,  


                                       21
<PAGE>

privileges,  qualifications,  limitations and  restrictions  thereof,  including
dividend  rights  and  rates,   conversion  rights,   voting  rights,  terms  of
redemption,  redemption prices, liquidation preferences and the number of shares
constituting  any series or the designation of such series,  without any vote or
action by the stockholders. The Company has no current plans for the issuance of
any shares of preferred stock. Any preferred stock to be issued could rank prior
to the Common Stock with respect to dividend  rights and rights of  liquidation.
The Board of Directors,  without stockholder approval, may issue preferred stock
with voting and conversion  rights that could adversely  affect the voting power
of  holders of Common  Stock or create  impediments  to persons  seeking to gain
control of the Company.

STOCK PURCHASE RIGHTS

      Laidlaw,  which,  as of March 31, 1998,  held  3,646,783  shares of Common
Stock, or 3.4% of the outstanding  Common Stock,  has certain rights to purchase
voting  securities  of the Company in order to maintain  its  percentage  voting
interest.  Except in  connection  with mergers or other  acquisitions  or in the
ordinary course under an employee stock option or stock bonus plan, in the event
the Company proposes to sell or issue shares of voting  securities,  Laidlaw has
the right to purchase, on the same terms as the proposed sale or issuance,  that
number  of shares or rights as will  maintain  its  percentage  interest  in the
voting  securities of the Company,  assuming the  conversion of all  convertible
securities  and the exercise of all options and warrants  then  outstanding.  In
addition,  Laidlaw has other purchase  rights with respect to sales or issuances
of securities by the Company at prices below 85% of current  market price at the
time of sale or issuance or the prevailing  customary  price for such securities
or their equivalent.

CERTAIN VOTING ARRANGEMENTS

      Pursuant to the agreements whereby the Company acquired Smogless S.p.A. in
September  1994,  Laidlaw  has  agreed  to vote all  shares  owned by it for the
nominees of the  Company's  Board for  election  to the Board,  and on all other
matters  in the same  proportion  as the votes  cast by other  holders of voting
securities,  other than those that relate to any business combination or similar
transaction  involving the Company or any amendment to the Company's Certificate
of Incorporation (the "Company Certificate") or By-laws.



                                       22
<PAGE>

      Pursuant to the agreement  whereby the Company  acquired the Properties in
exchange  for  8,000,000  shares of Common  Stock and the  Warrants in September
1997,  the Company has agreed,  so long as the parties from whom the  Properties
were acquired (the "Parties") own at least 5% of the  outstanding  Common Stock,
to nominate a person designated by the Parties for election to the Company Board
(the  "Designee").  The  Designee,  Ardon E. Moore,  has been  appointed  by the
Company's  Board of Directors to serve as a Class I director until the Company's
Annual Meeting in 2000. If a vacancy occurs in the Company's  Board of Directors
while the Parties own at least 7 1/2% of the  outstanding  Common Stock and such
vacancy is the result of the  cessation to serve of a  non-employee  director of
the Company  (other than the  cessation of service of a Designee,  which vacancy
shall be filled with a successor  Designee),  the Parties  must also approve the
person  filling such vacancy.  In addition,  the Parties have agreed to vote all
shares  owned  by  them as  recommended  by a  majority  of the  members  of the
Company's  Board of  Directors,  except  with  respect  to  certain  fundamental
transactions, transactions involving the issuance by the Company of Common Stock
representing  20% or more of the  outstanding  Common Stock (or  equivalents) or
amendment of the Company Certificate or By-laws.

CERTAIN CHARTER AND BY-LAW PROVISIONS

      The Company  Certificate places certain  restrictions on the voting rights
of a "Related  Person," defined therein as any person who directly or indirectly
owns 5% or more of the outstanding voting stock of the Company. The founders and
the  original  directors  of the Company are  excluded  from the  definition  of
"Related Persons," as are seven named individuals including Richard J. Heckmann,
the Chairman of the Board, President and Chief Executive Officer of the Company.
These voting restrictions apply in two situations. First, the vote of a director
who is  also a  Related  Person  is not  counted  in the  vote of the  Board  of
Directors to call a meeting of  stockholders  where that meeting will consider a
proposal made by the Related  Person  director.  Second,  any  amendments to the
Company  Certificate  that relate to specified  Articles  therein (those dealing
with corporate governance, limitation of director liability or amendments to the
Company  Certificate),  in addition to being  approved by the Board of Directors
and a majority of the Company's  outstanding voting stock, must also be approved
by either (i) a majority of directors who are not Related  Persons,  or (ii) the
holders of at least 80% of the Company's outstanding voting stock, provided that
if the change was proposed by or on behalf of a Related Person, then approval by
the holders of a 


                                       23
<PAGE>

majority of the  outstanding  voting  stock not held by Related  Persons is also
required.  In addition,  any amendment to the Company's By-laws must be approved
by one of the  methods  specified  in  clauses  (i) and  (ii)  in the  preceding
sentence.

      The Company  Certificate and the Company's  By-laws provide that the Board
of  Directors  shall fix the  number of  directors  and that the Board  shall be
divided into three classes,  each consisting of one-third of the total number of
directors (or as nearly as may be possible). Stockholders may not take action by
written  consent.  Meetings of  stockholders  may be called only by the Board of
Directors (or by a majority of its members).  Stockholder  proposals,  including
director  nominations,  may be considered at a meeting only if written notice of
that  proposal is  delivered to the Company from 30 to 60 days in advance of the
meeting,  or within  ten days  after  notice of the  meeting  is first  given to
stockholders.

DELAWARE ANTI-TAKEOVER LAW

      Section  203 of the  Delaware  General  Corporation  Law  ("Section  203")
provides,  in  general,  that  a  stockholder  acquiring  more  than  15% of the
outstanding  voting  shares  of  a  corporation   subject  to  the  statute  (an
"Interested  Stockholder"),  but less than 85% of such shares, may not engage in
certain "Business Combinations" with the corporation for a period of three years
subsequent to the date on which the stockholder became an Interested Stockholder
unless (i) prior to such date the corporation's  board of directors has approved
either the Business  Combination  or the  transaction  in which the  stockholder
became an Interested Stockholder or (ii) the Business Combination is approved by
the  corporation's  board  of  directors  and  authorized  by a vote of at least
two-thirds of the  outstanding  voting stock of the corporation not owned by the
Interested Stockholder.

      Section 203 defines the term  "Business  Combination"  to encompass a wide
variety of transactions with or caused by an Interested Stockholder in which the
Interested  Stockholder  receives or could receive a benefit on other than a pro
rata basis with other  stockholders,  including  mergers,  certain  asset sales,
certain   issuances  of  additional   shares  to  the  Interested   Stockholder,
transactions  with the corporation that increase the  proportionate  interest of
the Interested  Stockholder or transactions in which the Interested  Stockholder
receives certain other benefits.


                                       24
<PAGE>

      These  provisions  could  have  the  effect  of  delaying,   deferring  or
preventing a change of control of the Company.  The Company's  stockholders,  by
adopting an amendment to the Company  Certificate or the By-laws of the Company,
may elect not to be governed  by Section  203,  effective  twelve  months  after
adoption.  Neither  the  Company  Certificate  nor the  By-laws  of the  Company
currently excludes the Company from the restrictions imposed by Section 203.



                            VALIDITY OF COMMON STOCK

      The  validity  of the  Shares  will be  passed  upon  for the  Company  by
Kirkpatrick & Lockhart LLP, counsel to the Company.


                                     EXPERTS

      The consolidated  financial statements of United States Filter Corporation
and its  subsidiaries  as of March  31,  1996 and 1997 and for each of the three
years in the period  ended March 31, 1997 have been  incorporated  by  reference
herein and in the  registration statement  in reliance  upon the reports of KPMG
Peat Marwick LLP and Ernst & Young LLP, independent certified public accountants
as  stated in their  reports,  incorporated  by  reference  herein, and upon the
authority of said firms as experts in accounting and auditing.

      The combined financial  statements of the Systems and Manufacturing  Group
of Wheelabrator  Technologies Inc. as of December 31, 1994 and 1995 and for each
of the three years in the period ended December 31, 1995 have been  incorporated
by  reference  herein in  reliance  upon the  report of KPMG Peat  Marwick  LLP,
independent certified public accountants,  incorporated by reference herein, and
upon the authority of said firm as experts in accounting and auditing.

    The consolidated financial statements  of  Culligan Water Technologies, Inc.
as of January  31,  1997 and 1998 and the  related  consolidated  statements  of
operations, changes in stockholders' equity and cash flows for each of the three
years in the period ended January 31, 1998 have been  incorporated  by reference
herein  in  reliance  upon the  report  of KPMG Peat  Marwick  LLP,  independent
certified public accountants,  which report is incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.


                                       25
<PAGE>


      The aggregated  financial  statements of the Process Equipment Division of
United  Utilities Plc as of March 31, 1996 and 1995 and for each of the years in
the two year period  ended March 31, 1996 have been  incorporated  by  reference
herein in  reliance  upon the report of KPMG Audit  Plc,  independent  chartered
accountants,  which report is  incorporated  by reference  herein,  and upon the
authority of said firm as experts in accounting and auditing.

      The  aggregated  financial  statements of Protean Plc as of March 31, 1997
and for the year ended March 31, 1997 have been incorporated by reference herein
in  reliance  upon  the  report  of  KPMG  Audit  Plc,   independent   chartered
accountants,  which report is  incorporated  by reference  herein,  and upon the
authority of said firm as experts in accounting and auditing.

      The  consolidated  financial  statements  of The Kinetics  Group,  Inc. at
September  30, 1997 and 1996,  and for each of the two years in the period ended
September 30, 1997,  incorporated by reference herein have been audited by Ernst
& Young  LLP,  independent  auditors,  as set  forth  in  their  report  thereon
incorporated by reference  herein,  and are  incorporated by reference herein in
reliance  upon such report  given upon the  authority of such firm as experts in
accounting and auditing.

      The combined  financial  statements  of The Water  Filtration  Business (a
wholly owned  business of AMETEK,  Inc.) at December 31, 1996 and 1995,  and for
each of the three years in the period ended December 31, 1996,  incorporated  by
reference herein have been audited by Ernst & Young LLP,  independent  auditors,
as set forth in their report thereon  incorporated by reference herein,  and are
incorporated  by  reference  herein in reliance  upon such report given upon the
authority of such firm as experts in accounting and auditing.

      The  consolidated  financial  statements of Memtec  Limited as of June 30,
1997 and 1996 and for each of the three years in the period  ended June 30, 1997
incorporated  by  reference  herein have been so  incorporated  by  reference in
reliance on the report of Price Waterhouse,  independent  accountants,  given on
the authority of said firm as experts in auditing and accounting.

      The audited financial  statements of WaterPro  Supplies  Corporation as of
December  31, 1995 and for the period  from April 7, 1995 to  December  31, 1995
incorporated  by  reference  herein have been  audited by Arthur  Andersen  LLP,
independent  public  accountants  as  indicated  in their  report  with  respect
thereto, 



                                       26
<PAGE>

and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

      The  independent   valuation  report  of  The  Mentor  Group,   Inc.  is
incorporated  by reference  herein in reliance upon the authority of said firm
in giving said report.


                                       27
<PAGE>



===================================== ========================================

NO PERSON  HAS BEEN  AUTHORIZED  TO
GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS  OTHER  THAN  THOSE
CONTAINED IN THIS PROSPECTUS,  AND,
IF GIVEN OR MADE, SUCH  INFORMATION
OR  REPRESENTATIONS   MUST  NOT  BE
RELIED    UPON   AS   HAVING   BEEN
AUTHORIZED.  THIS  PROSPECTUS  DOES                                             
NOT  CONSTITUTE AN OFFER TO SELL OR      
THE SOLICITATION OF AN OFFER TO BUY      
ANY   SECURITIES   OTHER  THAN  THE                5,815,450 SHARES           
SECURITIES  TO WHICH IT  RELATES OR                                             
AN    OFFER    TO   SELL   OR   THE                                             
SOLICITATION  OF AN  OFFER  TO  BUY        UNITED STATES FILTER CORPORATION   
SUCH      SECURITIES     IN     ANY                                             
CIRCUMSTANCES  IN WHICH  SUCH OFFER                                             
OR    SOLICITATION   IS   UNLAWFUL.                 COMMON STOCK              
NEITHER   THE   DELIVERY   OF  THIS                                           
PROSPECTUS   NOR  ANY   SALE   MADE                                           
HEREUNDER    SHALL,    UNDER    ANY                                           
CIRCUMSTANCES,      CREATE      ANY                                           
IMPLICATION  THAT THERE HAS BEEN NO                                           
CHANGE  IN  THE   AFFAIRS   OF  THE                                           
COMPANY  SINCE  THE DATE  HEREOF OR    
THAT  THE   INFORMATION   CONTAINED
HEREIN  IS  CORRECT  AS OF ANY TIME
SUBSEQUENT TO ITS DATE.

                                                  ----------------
            -------------

          TABLE OF CONTENTS                          PROSPECTUS
   
                                PAGE              -----------------
Available Information............. 2
Incorporation of Certain
Documents by Reference............ 2
The Company....................... 3
Risk Factors...................... 4
Recent Developments ..............17
Use of Proceeds...................17
Selling Stockholders..............17
Plan of Distribution..............19
Description of Capital
 Stock............................20            
Validity of Common Stock..........25
Experts...........................25
    
                                               ___________, 1998
===================================== ========================================



<PAGE>




                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

      (a)  Exhibits.   The  following   exhibits  are  filed  as  part  of  this
registration statement:

     EXHIBIT
     NUMBER      DESCRIPTION
     -------     -----------
   
     5.01        Opinion of Kirkpatrick & Lockhart LLP as to the
                 legality of the securities being registered*

     23.01       Consent of Kirkpatrick & Lockhart LLP (included in
                 Exhibit 5.01)*

     23.02       Consents of KPMG Peat Marwick LLP and KPMG Audit plc**

     23.03       Consents of Ernst & Young LLP***

     23.04       Consent of Price Waterhouse*

     23.05       Consent of Arthur Andersen LLP*

     23.06       Consent of The Mentor Group, Inc.*
    
               *   Previously filed.
              **   Two consents filed herewith three consents previously filed.
             ***   One consent filed herewith; one consent previously filed.






<PAGE>


                                   SIGNATURES
   
      Pursuant to the requirements of the Securities Act of 1933, the registrant
has duly caused this  amendment  to be signed on its behalf by the  undersigned,
thereunto duly authorized,  in the City of Palm Desert, State of California,  on
May 14, 1998.
    
                              UNITED STATES FILTER CORPORATION

   
                              By:   /s/ Richard J. Heckmann
    
                                   --------------------------------
                                    Richard J. Heckmann
                                    Chairman of the Board, President
                                    and Chief Executive Officer


      Pursuant to the requirements of the Securities Act of 1933, this amendment
has been  signed by the  following  persons in the  capacities  and on the dates
indicated.

          Signature                      Capacity                 Date
          ---------                      --------                -----

   
/s/ Richard J. Heckmann          Chairman of the Board,    May 14, 1998
- -----------------------------    President and Chief
Richard J. Heckmann              Executive Officer
                                 (Principal Executive
                                 Officer) and a Director
    

   
/s/ Kevin L. Spence              Executive Vice            May 14, 1998
- -----------------------------    President/Chief
Kevin L. Spence                  Financial Officer
                                 (Principal Financial
                                 and Accounting Officer)
    

   
           *                     Executive Vice            May 14, 1998
- -----------------------------    President/Chief
Michael J. Reardon               Administrative Officer
                                 and a Director
    

   
           *                     President/Chief           May 14, 1998
- -----------------------------    Operating Officer -
Nicholas C. Memmo                Process Water Group and
                                 a Director
    

<PAGE>

          Signature                      Capacity                 Date
          ---------                      --------                -----

   
           *                     Director                  May 14, 1998
- -----------------------------
James E. Clark
    

   
           *                     Director                  May 14, 1998
- -----------------------------
John L. Diederich
    

   
                                 Director
- -----------------------------
Robert S. Hillas
    

   
           *                     Director                  May 14, 1998
- -----------------------------
Arthur B. Laffer
    

   
                                 Director
- -----------------------------
Ardon E. Moore
    

   
           *                     Director                  May 14, 1998
- -----------------------------
Alfred E. Osborne, Jr.
    

   
                                 Director
- -----------------------------
J. Danforth Quayle
    

   
           *                     Director                  May 14, 1998
- -----------------------------
C. Howard Wilkins, Jr.
    

   
*By:
/s/ Damian C. Georgino                                     May 14, 1998
- ----------------------
Damian C. Georgino
Attorney-in-Fact
    



<PAGE>

                                 EXHIBIT INDEX


23.02     Consent of KPMG Peat Marwick LLP and KPMG Audit Plc

23.03     Consent of Ernst & Young LLP



   
                                                                   Exhibit 23.02

                                                                     Page 1 of 2

                        CONSENT OF KPMG PEAT MARWICK LLP


The Board of Directors
Culligan Water Technologies, Inc.

We consent to the  incorporation by reference in the  Registration  Statement on
Form S-3 (No. 333-45981) of United States Filter Corporation of our report dated
April 7, 1998, with respect to the consolidated balance sheets of Culligan Water
Technologies,  Inc. as of January 31, 1998 and 1997 and the related consolidated
statements of operations,  stockholders'  equity, and cash flows for each of the
years in the  three-year  period ended January 31, 1998, and to the reference to
our firm under the heading "Experts" in the prospectus.


                                                       /s/ KPMG Peat Marwick LLP
Chicago, Illinois
May 14, 1998
    

<PAGE>
                                                             Exhibit 23.02

                                                                     Page 2 of 2

                            CONSENT OF KPMG AUDIT PLC


The Board of Directors 
Protean plc:

We consent to the incorporation  by reference in the  Registration  Statement on
Form S-3 (No.  333-45891) of the United States Filter  Corporation of our report
dated June 12, 1997,  relating to the consolidated  balance sheet of Protean plc
as of March 31, 1997, and the related consolidated profit and loss account, cash
flow  statement,  reconciliation  of net  cash  flow to  movement  in net  debt,
statement of total recognized gains and losses,  reconciliation  of movements in
shareholders' funds, and note of consolidated historical cost profits and losses
for the year ended  March 31,  1997 and to the  reference  to our firm under the
heading "Experts" in the prospectus.


                                                              /s/ KPMG Audit Plc
KPMG Audit Plc
Chartered Accountants and Registered Auditor
London
May 14, 1998





   

                                                                   Exhibit 23.03

                                                                 

                          CONSENT OF ERNST & YOUNG LLP


      We consent to the reference to our firm under the caption "Experts" in the
Registration  Statement  (Form  S-3,  No.  333-45981)  of United  States  Filter
Corporation  for the  registration  of  shares  of its  common  stock and to the
incorporation  by reference  therein of our report  dated March 14,  1997,  with
respect to the combined financial statements of The Water Filtration Business (a
wholly owned  business of AMETEK,  Inc.)  included in the Current Report on Form
8-K of  United  States  Filter  Corporation  dated May 12, 1998, filed  with the
Securities and Exchange Commission.



                                          /s/ Ernst & Young LLP
                                          Ernst & Young LLP
                                          Philadelphia, Pennsylvania
                                          May 14, 1998

    



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