Dophin The Dolphin filter is used by placing it on the inner surface of the aquarium with the help of 4 suction cups located on the rear section, ensuring it remains completely submerged in water. Only the air hose should remain outside the water. It is more suitable to clean the filter and change the water at the same time. It must be unplugged before cleaning. Open the cover and clean the large-pored sponge filter inside under a strong running tap. If the filter housing is removed and cleaned regularly, the filter will function more effectively. Supermarket