4 Pack of Compatible Filters for SHURflo 15500243 Replacement Filter Cartridge by CFS 4 Pack of Compatible Filters for SHURflo 15500243 Replacement Filter Cartridge by CFS 4) NSF Certified 5 Micron Carbon Filters Fits most brand housings Filter cartridge reduces chlorine, sediment, unpleasant taste/odor and VOC's