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……Non Threaded Type…..Thick Layer Premium Quality Food Grade Cartridge Candle, 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.