Review on 💧 Pentek R50 BB Pleated Polyester Cartridge: High-Performance Filtration for Superior Water Quality by Heather Collins

The advert says it fits most "big blue" water filter housings and it fits mine. This is the same micron filter as the filters my water treatment company installed (until they lost all help and stopped scheduling appointments due to the pandemic). However, when you first take the filter and attach it to the filter housing, you'll swear it's an inch longer. However, it fits into the case's screw cap, which makes all the difference. Look for a label that says "10" on the blue case. These will fit.