We recommend Crystal Quest CQE-RC-04024 Calcite Acid Neutralizer Water Filter Cartridge 20", Remineralizing Filter. Calcite and Coconut Shell GAC 20"x2.5" acid neutralizer cartridge. Is used for the remineralization of soft, acidic, or low pH water. Can also be used as last polishing or remineralizing cartridge in Reverse Osmosis systems. The Coconut Shell carbon is used as post-polisher in this water filter cartridge. Calcite Acid Neutralizer Cartridge properties: * Capacity: 8000 gallons * Operating Temperatures: 40 F - 100 F (5 C - 39 C) * Pressure: 20-125 PSI * Filter type: 5 micron * Filter Size: 20x2.5 inches Calcite Acid neutralizer Water Filter fits into a standard 20"x2.5" water filter housing..

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