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The Watts GAC-BB20K 1800 is a 20 inch KDF and GAC filter replacement for use in many water filter systems. The Watts GAC-BB20K 1800 is a large diameter filter (4 1/2″ diameter) that can be used in all 20″ x 4.5″ filter
The Watts 10 Micron 20″ KDF GAC Filter Replacement Cartridge (Watts IF-SM-KDF020B) is a 20 inch GAC and KDF filter replacement for use in many water filtration systems especially whole house filter systems. The Watts IF-SM-KDF02
