Aquarium Top Filter For Clear Water & Bio Filtration. Helps remove impurities through mechanical and biological filtration, with a top-mounted design for convenient access during maintenance. + Aquarium Bio Sponge Pad Pack Better Filtration & Beneficial Bacteria Support. Filter media designed to trap suspended particles and support beneficial bacteria. Cut to fit compatible aquarium filtration systems where applicable.+Bio-Logical 6 In 1 Aquarium Filter Cotton Sponge Cut-To-Size White Filter Pad For Top Filter, Sump, Hang-On, Canister And Diy Aquarium Filtration.. Helps remove impurities through mechanical and biological filtration, with a top-mounted design for convenient access during maintenance.