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The Watts 5 Micron Pleated 10" Big Blue Filter Cartridge is a 10"L x 4 1/2"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.This Watts Big Blue pleated water filter uses advanced synthetic pleated polypropylene filtration technology for a larger filter surface area, longer cartridge life, higher flow rate, greater dirt holding capacity, lower pressure drop, and more efficient sediment filtration when compared to other sediment filters which use different types of filter media such as resin, melt blown, spun, string wound, etc. This Watts pleated filter is a compatible replacement for similar Big Blue pleated sediment filter brands of all types including Pentek filters, Ametek filters, Culligan filters, Whirlpool filters, US Filter filters, Ace filters, American Plumber filters, Bruner filters, Plymouth filters, Pentair filters, and other name brands. It will fit all whole house filter housings which use a 10" x 4.5" Full Flow water filter replacement cartridge.