I have a three stage DuPont filter that fits two 70001 cartridges and one 90001 cartridge. I decided to try them at half price DuPont WFQTC70001. So far, so good. No leaks and high consumption. If they last I will buy them again next year. The 90001 microbiological filter is becoming increasingly difficult to find; The only ones I can find here at Revain cost over a hundred dollars (should be around sixty) so I had to buy them elsewhere. If this seller or manufacturer is reading these reviews, maybe they could consider replacing the DuPont WFQTC90001 and they could look into it too!
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