I just got a response back from Mr. Heater and you do NOT need to use a filter if you use the hose that is Plasticizer Free.
Date: Monday, December 8, 2008 2:47 PM
From: Sisley Bill <
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To:
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Subject: RE: Mr Heater CONTACT US - PRODUCT INQUIRY Form
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Charlie,
Correct, no filter needed with the plasticizer free hose. The
plasticizer free hose is only available in 10' lengths.
Thank you,
Bill Sisley
Technical Service Manager