Long Life of the Cartridge when compared to ordinary Spun Filter. Excellent Filtration along with life. RO 10 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. 5 Micron Spun Filter for RO water purifier removes all sediments, visible particles, sand, rust, dirt and muck down to 1 micron. It is suitable for filtration of sediment in stand alone housings after pump on well or suitable for filtration as a prefilter on all water systems.