I use a Culligan water filter housing model HF-150a. It takes a Pentek P 1 filter. 2-38 X 9-7/8. OK looking for a .35-.45 micron filter for my Peach & Apple wines. Filters Fast only sells their .35 m filters in a 24 pack, $268.99. McMaster Carr has a .5m but it's a 10" & has the plastic seals top & bottom. Plus I really think I need the .45 or less. Anyone have suggestions, thanks, Roy. emailed both companies & this is their response.