ELCCOTYA 16 Pack PF-L Fish Tank Filter Cartridges, Aquarium Filter Cartridges Replacement Compatible with Top Fin Silenstream PF20, PF30, PF40 and PF75 Power FiltersBrand: ELCCOTYA Color: White Features: Filter Cartridges for Aquarium Filtration: The PF L Fish Tank Filter Cartridges is 6 inches in length and 4. 5 inches in width, Compatible with Top Fin PF20, PF30, PF40 and PF75 Power Filters. Dedicated to the clarity of the water and the healthy environment of the fish. Easy Installation in a few seconds: First remove the used filter element, and then rinse the new filter element with clean water to remove the