UNITED STATES FILTER CORP
S-4/A, 1998-05-14
REFRIGERATION & SERVICE INDUSTRY MACHINERY
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      As filed with the Securities and Exchange Commission on May 14, 1998
    
                                          Registration No. 333-52487
       =================================================================
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

   
                            ----------------------
                               AMENDMENT NO. 1 TO
                                   FORM S-4
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                         
                             ---------------------
                        UNITED STATES FILTER CORPORATION
             (Exact name of registrant as specified in its charter)

DELAWARE               3589                    33-0266015
- --------               ----                    ----------
(State or other        (Primary Standard       (I.R.S. Employer
jurisdiction           Industrial              Identification
of incorporation       Classification          No.)
or organization)       Code Number)

                               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

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

<PAGE>

If the securities  being registered on this Form are being offered in connection
with the  formation of a holding  company and there is  compliance  with General
Instruction G, check the following box. /  /

      The registrant hereby amends this  registration  statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further  amendment  which  specifically  states  that  this  registration
statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities  Act of 1933 or until this  registration  statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.


<PAGE>


   
                  SUBJECT TO COMPLETION, DATED MAY 14, 1998
    
      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.


PROSPECTUS
       , 1998


                              12,881,860 SHARES

                       UNITED STATES FILTER CORPORATION

                                 COMMON STOCK
                          (PAR VALUE $.01 PER SHARE)

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

      This Prospectus  relates to 12,881,860 shares (the "Shares") of the Common
Stock,  par value $.01 per share  ("Company  Common  Stock"),  of United  States
Filter  Corporation  (the  "Company")  which may be  offered  and  issued by the
Company  from time to time in  connection  with the  acquisition  by the Company
directly, or indirectly through  subsidiaries,  of various businesses or assets,
or interests therein. The Shares may be issued in mergers or consolidations,  in
exchange  for shares of capital  stock,  partnership  interests  or other assets
representing  an  interest,  direct or  indirect,  in other  companies  or other
entities, or in exchange for tangible or intangible assets,  including,  without
limitation,  assets  constituting  all or  substantially  all of the  assets and
businesses of such entities.  Shares may also be reserved for issuance  pursuant
to, or  offered,  issued and sold upon  exercise  or  conversion  of,  warrants,
options, convertible debt obligations,  equity securities,  contingent rights or
other similar  instruments  or rights issued by the Company from time to time in
connection  with any such  acquisition.  In certain  instances,  the Company may
guaranty  that some or all of the 


<PAGE>

aggregate net proceeds from the sale of Shares during a limited period following
their  issuance will not be less than the  valuation  used for purposes of their
issuance,  or a specific amount related to such  valuation,  and may make up any
shortfall  (including any shortfall  attributable  to brokers'  commissions  and
selling expenses) by issuing additional Shares under this Prospectus or in cash.

       It is expected that the terms of  acquisitions  involving the issuance of
Shares will be determined by direct  negotiations with the owners or controlling
persons  of the  businesses  or assets to be  acquired,  and that the  Shares so
issued  will be valued at prices  based on or related  to market  prices for the
Common Stock on the New York Stock  Exchange,  Inc. (the "NYSE") at or about the
time the  terms of an  acquisition  are  agreed  upon or at or about the time of
delivery of such Shares, or based on average market prices for periods ending at
or about such times.  No  underwriting  discounts or  commissions  will be paid,
although brokers' or finders' fees may be paid from time to time with respect to
specific acquisitions; under some circumstances, the Company may issue Shares in
full or partial payment of such fees. Any person  receiving any such fees may be
deemed to be an underwriter  within the meaning of the United States  Securities
Act of 1933, as amended (the "Securities Act").

      With the  consent  of the  Company,  this  Prospectus  may also be used by
persons  ("Selling  Stockholders")  who have received or will receive  Shares in
connection  with  acquisitions  and who  may  wish to  sell  such  Shares  under
circumstances requiring or making desirable its use. See "Resales of Shares."

   
      The Shares will, prior to their issuance,  be listed on the NYSE subject
to official  notice of  issuance.  The Common Stock is 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, as amended (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.

      The Company has filed with the Commission  registration statements on Form
S-4 (herein,  together  with all  amendments  and  exhibits,  referred to as the
"Registration Statements") under the Securities Act with respect to the offering
made hereby.  This  Prospectus does not contain all of the information set forth
in the  Registration  Statements,  certain  portions  of which  are  omitted  in
accordance  with the rules and  regulations of the  Commission.  Such additional
information  may  be  obtained  from  the   Commission's   principal  office  in
Washington,  D.C. as set forth  above.  For further  information,  reference  is
hereby made to the  Registration  Statements,  including the exhibits filed as a
part  thereof  or  otherwise  incorporated  herein.   Statements  made  in  this
Prospectus as to the contents of any documents  referred to are not  necessarily
complete,  and in each  instance  reference  is made to such  exhibit for a more
complete description and each such statement is modified in its entirety by such
reference.



                                       2
<PAGE>

                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 Form 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/A 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.
    

     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   Statements  and  prior  to   effectiveness  of  the  Registration
Statements or 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 



                                       3
<PAGE>

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  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



                                       4
<PAGE>

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
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 



                                       5
<PAGE>

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 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  



                                       6
<PAGE>

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.

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.

                                       7
<PAGE>

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.

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


                                       8
<PAGE>

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  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



                                       9
<PAGE>

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 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.



                                       10
<PAGE>

      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  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 



                                       11
<PAGE>

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.
    

      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



                                       12
<PAGE>

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,  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 



                                       13
<PAGE>

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 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.



                                       14
<PAGE>

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-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


                                       15
<PAGE>

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. 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 



                                       16
<PAGE>

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."
    

   
                              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.
    


                               RESALES OF SHARES

      With the consent of the Company,  this  Prospectus  may be used by Selling
Stockholders  who have  received  or will  receive  Shares  in  connection  with
acquisitions and who may wish to sell such Shares under circumstances  requiring
or  making  desirable  its  use.  The  Company  may  consent  to the use of this
Prospectus by Selling  Stockholders  for a limited period of time and subject to
limitations and conditions which may be varied by agreement  between the Company
and one or more  Selling  Stockholders.  Agreements  with  Selling  Stockholders
permitting  use of this  Prospectus  may  provide  that an offering of Shares be
effected in an orderly manner through  securities  dealers,  acting as broker or
dealer,  selected by the Company;  that Selling  Stockholders enter into custody
agreements with one or more banks with respect to such Shares; and that sales be
made  only by one or more  of the  methods  described  in  this  Prospectus,  as
appropriately supplemented or amended when required. Other than in circumstances
where the Company may receive certain benefits in connection with price guaranty
arrangements,  the Company will not receive any of the proceeds from any sale of
Shares offered hereby by a Selling Stockholder.

      Shares  may be  sold  by  Selling  Stockholders  hereunder  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 the 



                                       17
<PAGE>

broker solicits  purchasers;  in block trades in which the broker or dealer 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;  through underwriters or agents; 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.  Any
brokers,  dealers,  underwriters or agents may arrange for others to participate
in any such  transaction and may receive  compensation in the form of discounts,
commissions or concessions  from Selling  Stockholders  and/or the purchasers of
Shares.  The proceeds to a Selling  Stockholder  from any sale of Shares will be
net of any such  compensation  and of any  expenses  to be borne by the  Selling
Stockholder.  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, the names of any underwriters,  brokers, dealers
or  agents  and any  discounts,  commissions  or  concessions  and  other  items
constituting compensation from the Selling Stockholder.

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

      The Company may agree to indemnify  Selling  Stockholders  and/or any such
brokers,  dealers,  underwriters  or agents against  certain civil  liabilities,
including  liabilities  under the  Securities  Act,  and to  reimburse  them for
certain expenses in connection with the offering and sale of Shares.

      Selling  Stockholders may also offer shares of Common Stock issued in past
and  future   acquisitions  by  means  of  prospectuses  under  other  available
registration   statements  or  pursuant  to  exemptions  from  the  registration
requirements of the Securities Act,  including sales which meet the requirements
of Rule 144 or Rule 145(d) under the Securities Act.

                                       18
<PAGE>


                         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 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


                                       19
<PAGE>

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,  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  



                                       20
<PAGE>

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.

      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



                                       21
<PAGE>

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 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 



                                       22
<PAGE>

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.

      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 



                                       23
<PAGE>

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,  1996 and 1997 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, 1997 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.

      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.



                                       24
<PAGE>

      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, 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.




                                       25
<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                12,881,860 SHARES         
THE SOLICITATION OF AN OFFER TO BUY                                             
ANY   SECURITIES   OTHER  THAN  THE                                           
SECURITIES  TO WHICH IT  RELATES OR        UNITED STATES FILTER CORPORATION  
AN    OFFER    TO   SELL   OR   THE                                            
SOLICITATION  OF AN  OFFER  TO  BUY                                            
SUCH      SECURITIES     IN     ANY                  COMMON STOCK            
CIRCUMSTANCES  IN WHICH  SUCH OFFER         
OR    SOLICITATION   IS   UNLAWFUL.
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

                                   PAGE              ---------------

Available Information..............2
Incorporation of Certain                                PROSPECTUS
  Documents by Reference...........3
The Company........................3                 ---------------
Risk Factors.......................4
Recent Developments................17
Resales of Shares..................17
Description of Capital Stock.......19
Validity of Common Stock...........23
Experts............................23


                                                     ___________, 1998

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



<PAGE>

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20.  Indemnification of Directors and Officers.

      The  Certificate of  Incorporation  and the By-laws of the Company provide
for  the  indemnification  of  directors  and  officers  to the  fullest  extent
permitted by the General Corporation Law of the State of Delaware,  the state of
incorporation of the Company.

      Section  145 of the  General  Corporation  Law of the  State  of  Delaware
authorizes  indemnification when a person is made a party or is threatened to be
made a party to any  proceeding by reason of the fact that such person is or was
a director,  officer,  employee or agent of the corporation or is or was serving
as a director,  officer, employee or agent of another enterprise, at the request
of the  corporation,  and if such  person  acted in good  faith  and in a manner
reasonably  believed  by  him or her to be in,  or  not  opposed  to,  the  best
interests of the  corporation.  With respect to any  criminal  proceeding,  such
person must have had no reasonable  cause to believe that his or her conduct was
unlawful.  If it is  determined  that the  conduct of such  person  meets  these
standards,  he or she  may  be  indemnified  for  expenses  incurred  (including
attorney's fees),  judgments,  fines and amounts paid in settlement actually and
reasonably incurred by him or her in connection with such proceeding.

      If such a  proceeding  is  brought  by or in the right of the  corporation
(i.e.,  a derivative  suit),  such person may be  indemnified  against  expenses
actually  and  reasonably  incurred  if he or she  acted in good  faith and in a
manner  reasonably  believed by him or her to be in, or not opposed to, the best
interests of the corporation.  There can be no  indemnification  with respect to
any matter as to which such person is adjudged to be liable to the  corporation;
however,  a court may,  even in such case,  allow such  indemnification  to such
person for such expenses as the court deems proper.

      Where  such  person is  successful  in any such  proceeding,  he or she is
entitled to be indemnified  against expenses actually and reasonably incurred by
him or her. In all other cases,  indemnification is made by the corporation upon
determination by it that  indemnification  of such person is proper because such
person has met the applicable standard of conduct.


                                      II-1
<PAGE>


      The Company  maintains an errors and  omissions  liability  policy for the
benefit of its officers and  directors,  which may cover certain  liabilities of
such individuals to the Company.


ITEM 21.  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.


ITEM 22.  UNDERTAKINGS.

      The undersigned registrant hereby undertakes:

      (1) To file,  during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

            (i)   To  include  any  prospectus   required  by  section   10(a)(3
                  of  the Securities Act of 1933;

            (ii)  To reflect in the prospectus any facts or events arising after
                  the effective date of the registration  statement (or the most
                  recent post-effective  amendment thereof) which,  individually
                  or in the  aggregate,  represent a  fundamental  change in the
                  information set forth in the registration statement;


                                      II-2
<PAGE>

          (iii)   To include any material  information  with respect to the plan
                  of distribution  not previously  disclosed in the registration
                  statement or any material  change to such  information  in the
                  registration statement.

      (2)  That,  for  the  purpose  of  determining  any  liability  under  the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities  at the time shall be deemed to be the initial bona
fide offering thereof.

      (3) To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

      (4) That, for purposes of determining  any liability  under the Securities
Act of 1933, each filing of the  registrant's  annual report pursuant to section
13(a)  or  section  15(d)  of the  Securities  Exchange  Act  of  1934  that  is
incorporated by reference in the registration  statement shall be deemed to be a
new registration  statement relating to the securities offered therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

      (5) That  prior to any  public  reoffering  of the  securities  registered
hereunder  through  use of a  prospectus  which  is a part of this  registration
statement,  by any person or party who is deemed to be an underwriter within the
meaning of Rule 145(c),  the issuer  undertakes that such reoffering  prospectus
will contain the information called for by the applicable registration form with
respect to reofferings by persons who may be deemed underwriters, in addition to
the information called for by the other Items of the applicable form.

      (6) That every  prospectus  (i) that is filed  pursuant to  paragraph  (5)
immediately preceding, or (ii) that purports to meet the requirements of section
10(a)(3) of the Act and is used in  connection  with an  offering of  securities
subject to Rule 415, will be filed as a part of an amendment to the registration
statement and will not be used until such amendment is effective,  and that, for
purposes of determining  any liability  under the  Securities Act of 1933,  each
such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

      (7) To  respond  to  requests  for  information  that is  incorporated  by
reference  into the  prospectus  pursuant to Items 



                                      II-3
<PAGE>

4, 10(b),  11, or 13 of this Form,  within one  business  day of receipt of such
request,  and to send the  incorporated  documents  by first class mail or other
equally prompt means.  This includes  information  contained in documents  filed
subsequent to the effective date of the registration  statement through the date
of responding to the request.

      (8)  To  supply  by  means  of a  post-effective  amendment  all  required
information  concerning a transaction,  and the company being acquired  involved
therein, that was not the subject of and included in the registration  statement
when it became effective.

      Insofar as  indemnification  for liabilities  arising under the Securities
Act of 1933 may be permitted to directors,  officers and controlling  persons of
the  registrant  pursuant  to  the  foregoing  provisions,   or  otherwise,  the
registrant  has been advised that in the opinion of the  Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore,  unenforceable. In the event that a claim for indemnification
against such  liabilities  (other than the payment by the registrant of expenses
incurred or paid by a director,  officer or controlling person of the registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been  settled by  controlling  precedent,  submit to a court of  appropriate
jurisdiction the question whether such  indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.



                                      II-4
<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
    


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

   
            *                    Director                  May 14, 1998
- -----------------------------
John L. Diederich
    
                                 Director                 
- -----------------------------
Robert S. Hillas


<PAGE>

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

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


                                 Director                 
- -----------------------------
Alfred E. Osborne, Jr.

   
              *                  Director                  May 14, 1998    
- -----------------------------
J. Danforth Quayle
    

                                 Director                  
- -----------------------------
C. Howard Wilkins, Jr.

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



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