Fits 20" Big Blue & Big White filter housings. Pleated polyester cloth cartridge with a large surface area give them excellent flow rates and service life. Simply clean filter when flow starts to slow or filtration starts to drop. Easy to clean by simply using a garden hose and spraying off dirt. Filters can be washed over & over and reused. Unicel is made in the USA and has White end caps Additional Details ------------------------------ Product description: Fits 20" Big Blue & Big White filter housings. Pleated polyester cloth cartridge with a large surface area give them excellent flow rates and service life. Simply clean filter when flow starts to slow or filtration starts to drop. Easy to clean by simply using a garden hose and spraying off dirt. Filters can be washed over & over and reused. Unicel is made in the USA and has White end caps