20 inch particulate filter for removal of 5 micro plus organisms and materials. Removal of rust, sand, organic material and suspended contaminates. Made from a spun polyester material. Made from poly spun material providing great filtering results in an inexpensive format. While provide shorter filter life than a pleated filter there is no reduction in the quality finished product. great substitute when price is a concern. Filter fits most manufactured housings and filter systems on the market providing a reasonable alternative to some manufacturers high priced filter and still providing the same finished product.