OES1521 Features: * Cartridge * Increases clarity of your entire home"s water by reducing sediment, which extends the life of appliances that process water * Filters up to 15,000 gallons * Lasts up to 3 months * Psi release Includes: * Includes two universal 10-inch cartridge that fit all filter systems, and most other brands of standard-size systems Construction: * Polypropylene construction