The Aries AF-20-2011-BB 20" Big Blue GAC filter is manufactured for your 20" housings. This big blue gac water filter is a replacement water filter and it will reduce contaminants and harmful particulates from your homes drinking water. This kdf water filter cartridge will remove mercury, iron and microorganisms from your water. Aries AF-20-2011-BB Water Filter Cartridge Specifications: Contains 1 replacement filter Part Number: AF-20-2011-BB 1 lb. 20" specialty filter KDF filter media This granular activated carbon filter will also remove the unpleasant taste and smell associated with chlorine. The Aries AF-20-2011-BB 20 inch big blue filter is a genuine OEM part manufactured out of durable, long lasting material.