20 to 1 Micron Density. Suitable for all 20" STD housings. Holds more dirt and impurities than normal Depth poly spun or pleated filters. Please note this filter is not a normal Polyspun Depth Cartridge it is the highest quality NSF approved Dual Gradient Density.
Compatible with the Puretec PX012, Davey 1PS20, and WSI-PPC25-2001 cartridges.