API Filstar XP Filter Super Micro-Filtration Pads, 2-Count Contains one (1) API FILSTAR XP SUPER MICROFILTION Aquarium Canister Filter Filtration Pads 2-Count Uses mechanical filtration to filter small waste particles. Microfiltration pad is dual-density for maximum absorption. For use in all aquariums. Use to filter aquarium water during the cleaning or water-changing process.