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The Aries AF-20-3231-BB replacement water filter cartridge fits the following water filter housings: Big Blue 20 inch housings The Aries 20" BB 100% Calcite Cartridge AF-10-3231-BB is a drinking water filter cartridge made of 100% calcite to provide you with clean, great tasting drinking water. This Aries 100% calcite cartridge is 20 inches high. The Aries AF-20-3231-BB specifications: Length: 20" Made of 100% calcite Measures 20 inches high Part number AF-20-3231-BB Compatible with 20" Big Blue housings