The Watts 20 Micron Pleated 20" Big Blue Filter Cartridge
(Watts WPC20FF20) is a 20 inch L x 4 1/2 inch D pleated water filter replacement
cartridge used primarily in whole house water filter systems to reduce sediment
as well as many contaminants such as dirt, turbidity, limescale, rust, sand,
silt, and other common particulates and impurities.