Air powered sponge filter, super quiet, provides both mechanical biological filtration, increase oxygen, aeration, filtration 3 in 1, suitable for freshwater saltwater High density porous 60ppi fine sponge, protect baby fish from being sucked into the filter system, provides more surface area for the growth of beneficial tiny creatures, traps floating debris fine particles, keep your fish tank crystal clear clean, closer to the natural water quality Easy to set up: no air stone needed, using an airline, connect one end to you air pump the other end to this attached lift tube, equipped with a check valve on air line, to prevent water backflow air pump damage due to power outage, provides both aeration filtration in one solution, great way to clean oxygenate your tanks Easy to use clean: squeeze out the air in the sponge when you put it underwater, then it will suck into water keep down at the bottom; simply take out the sponge, rinse squeeze it in used aquarium water, recommend to clean the sponges weekly regularly, recommend to replace the sponge every 5 to 6 months maximum Multipurpose: works perfectly as a secondary filter or prefilter, easy to hide behind plants decor, fit any corner, great for shrimp tank, breeding tank, betta tank, nano tank, turtle tank, fry tank, goldfish, baby fish or other fish