Joy Home Moonorange Aquarium Bio Sponge Filter, Super-Quiet Submersible Fish Tank Foam Filter with 1 Spare Sponge, Suits Tanks Within 20 Gallon Sponge Aquarium Filter  (Mechanical Filtration for Salt Water and Fresh Water)

【Double Filter Function】Provides both physical and biochemical filtration. Traps debris or wastes without sucking up your fish. The sponge and filter media are cleanable and replaceable, keeps your aquarium crystal clean. 【Detachable Design】Easy to install and detach for cleaning. Rinse it every 1-2 weeks with aquarium water ONLY. Avoid washing it in tap water! 【TWO-usage Modes】An air outlet tube added to suit tanks in different heights. Size S suits tanks with height max. 18 inches. Size L suits tanks with height max. 25 inches. 【How to Set up?】1. Take off the sponge cover and remove 1pc sponge. 2. Loosen the sponge to resume its normal size. 3. Insert L-connector to the filter and connect it with an air pump. 4. Soak and squeeze the sponge until it falls onto tank base before turn the air pump on.