Filter Cartridge, Capacity Grains 5, 400, Flow Rate 3 GPM, Material of Construction Cation Resin, Outside Dia 4 1/2 In, Length 20 In, Max Pressure 125 PSI, Max Temp 100 F, Application Water Softening, For Use With 4TMG1, Standards NSF 42 RestrictionsCalifornia Proposition 65 Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. Water Softener Cartridge Systems100% Dow cation resin filtering media softens hard water to save on detergent use, and is helpful as a pre-RO system. Heavy-duty polypropylene construction has superior chemical resistance. Change out cartridges with no tools necessary.Max. pressure: 125 psi Temp. range: 40 to 100 F