Committed to fishkeeping success for over 40 years the brand is the professional s choice for commercial display systems and scientific research. Marineland brand provides a full line of aquarium filter accessories to create a clean and healthy aquatic environment for your fish. Marineland Polishing Filter Pads for mechanical filtration act as a water polisher screening out fine particulates to promote increased water clarity. Place one filter pad on top of your filter tray on top of the biological media. Replace monthly as polishing pads get clogged with debris over time. Do not attempt to clean and reuse. For use with Marineland C-Series and/or Magnaflow Canister Filters (see packaging for sizing details). Fits 530. Clean sparkling water is the mark of a healthy thriving aquarium. The amount of filtration needed to maintain an aquarium depends on a number of variables. These include tank size individual maintenance habits and fish population.