Model WFM-17(Walgreens) or FM-15. Filters 200 gallons. Hands down best water faucet filter ever made. The only reason why it got replaced is because it gotten clogged from too much contamnants. There was never a leak, but I did have to re-tighten it every now and then. I never used teflon tape but highly suggest it. This lasted me 21 months before the knob refused to open fully for the water to get filtered through. The taste is no different from all the other brands. Are you tired of over-paying high prices for leaking Pur and Brita brands, this will fix your problems. Filter unit 19-25 dollars. Filter itself 11-15 dollars. Overall rating 9/10. One last thing, the product does not come with correct attachments, but when do any of them do?