American Plumber W20CLHD Pleated Cellulose Water Filters: The American Plumber W20CLHD water filter replacement cartridge is used to reduce sediment, sand, and silt down to 20 microns. Pleated Resin Impregnated Cellulose 20 Micron, 10" length 9.75” L x 4.50” W; 20 Micron Nominal Filtration; Sediment Reduction American Plumber W20CLHD water filters can be used in all big blue, big clear, big boy, and heavy-duty water filter housings that use 10" L x 4.5" W water filters. The American Plumber W20CLHD is made by Pentek (Pentair Inc.) and is the same filter as the Pentek S1-BB water filter.