Rainfresh SW Series sediment filter cartridges remove dirt, rust, sand, silt and other particulate matter from water. Featuring a string wound construction SW Series cartridges are ideal for residential whole-house filtration, RO pre-filtration, food and beverage and even commercial and industrial applications. SW Series filter cartridges are manufactured using 100% food-grade polypropylene. No additives or binders are used during the manufacturing process, resulting in a pure product that does not leech out extractables in during use. SW Series filter cartridges exhibit high dirt holding efficiency at the rated micron size and low pressure drops with excellent flow characteristics.