API Filstar XP Filtration Foam Aquarium Canister Filter Filtration Pads, 2 Per Pack Contains one (1) API FILSTAR XP FILTRATION FOAM Aquarium Canister Filter Filtration Pads 2-Count Ideal to filter large waste particles Designed to fit API FILSTAR xP canisters filters For use in freshwater and saltwater aquariums Wash monthly, replace every 3 months