The Harmsco PP-BB-20-1 gets rid of cysts, sediment, silt, and different harmful organisims to absolutely the micron level of 1.The Harmsco PP-BB-20-1 Poly-Pleat Pleated Water Clear out Cartridge is a 20″ x 4.5″ sediment Clear out to be able to are compatible in such a lot usual housings. The Harmsco PP-BB-20-1 gives an absolute micron rating of 1 and a glide rate of 0.5 gpm.