Fits Home Master Carbon Filter. Typical lifecycle: 100,000-Gallon or 1 year. Radial Flow design provides excellent chlorine and chemical filtration with minimal pressure drop. Feed water: PSI 20 – 100 PSI. Feed water Temperature: 40 Degree – 100 Degree F. This Radial Flow GAC water filter (model CFRFGAC20-20BB) fits all Home Master Whole House water filtration systems, as well as 20-inch Big Blue filter housings. Offering ideal carbon filtration for high flow applications, the filters coconut shell activated carbon provides improved taste, smell and purification, and its radial flow design provides excellent iron reduction with minimal pressure drop. Whole House Granular Activated Coconut Shell Carbon Water Filter -, 20 micron, 20-Inch x 4.5-Inch. Fits: Home Master Water Filter, 20-Inch Big Blue filter housing. Coconut shell activated carbon for improved taste, smell and purification. Ideal carbon filtration for high flow applications.