purewell pf-4 ceramic 3-stage purification elements, washable & reusable, nsf/ansi 42&372 certified, replacement for proone®, berkey®, purewell® filters and water filter systems 2 pack is up for auction in Home & Kitchen. The current bid is $1.00, 98% below the $64.58 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.