Aqua Pure AP810 large-diameter cartridges.  5-micron cartridge. The AP810 is capable of removing most types of contaminants from household drinking water, including particulate matter. A flow rate of 20 gpm to 28 gpm (65.7 lpm - 105.9 lpm) ensures a reasonably sufficient supply of purified water throughout the day. Compatible with all conventional housings.  Cuno part number # 5618902, 56189-02.