Exhibit 23.06 THE MENTOR GROUP, INC. 777 EAST TAHQUITZ CANYON WAY #200 PALM SPRINGS, CALIFORNIA 92262 May 7, 1998 Mr. Kevin L. Spence Chief Financial Officer United States Filter Corporation 40-004 Cook Street Palm Desert, CA 92211 Re: Consent of Independent Appraisers Letter Dear Kevin: We hereby consent to the incorporation herein of our January 31, 1998 independent valuation report of the In-Process Research and Development acquired by United States Filter Corporation ("U.S. Filter") from Memtec Limited in the U.S. Filter Form S-3 dated March 31, 1998, addressing the Securities and Exchange Commission comment letter dated March 13, 1998 on the U.S. Filter Registration Statement on Form S-3 filed February 10, 1998. We also consent to the reference to The Mentor Group, Inc. under the heading "Experts" in such Form S-3. If you require anything further pursuant to this matter, please do not hesitate to call. Sincerely, THE MENTOR GROUP, INC. /s/ John D. Glenn John D. Glenn President and Managing Director