he Aries AF-20-2115-BB water filter cartridge fits the following water filter housings: Big Blue 20 inch housings The Aries AF-20-2115-BB 20" Big Blue KDF/GAC Filter is a drinking water filter cartridge made of 1.5 pounds of KDF mixed with granular activated carbon (GAC). This 20 inch Big Blue filter reduces chlorine, bad taste and odor, and water-soluble heavy metals from your drinking water, and also controls scale, bacteria, and algae. This KDF water filter cartridge provides you with clean, pure, great tasting drinking water. The Aries AF-20-2115-BB specifications: 20" length Part number AF-20-2115-BB Reduces chlorine, bad taste and odor, and water-soluble heavy metals Controls scale, bacteria, and algae 1.5 pounds of KDF mixed with GAC