20 Inch, 5 Micron PP Spun Filter Cartridge/Candle used in RO Water Filter-Pre/Outer Filter Bowl For Commercial Water Purifier. Long Life of the Cartridge when compared to ordinary Spun Filter. Excellent Filtration along with life. RO 20 Inch, 5 Micron PP Spun Filter Cartridge/Candle used in Pre Filter Bowl, It stop mud, rust, silt and all physical impurities from raw water. Removes the Sewerage impurities from the Public water supply. Reduces RO Membrane damage and save money. Can be used in any pre filter that supports 20 inch pre filter.