Air powered sponge filter, super quiet, provides both mechanical and biological filtration, increase oxygen, aeration, filtration 3 in 1, suitable for freshwater and 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 and fine particles, keep your fish tank crystal clear and 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 and the other end to this attached lift tube, and equipped with a check valve on air line, to prevent water backflow and air pump damage due to power outage, provides both aeration and filtration in one solution, great way to clean and oxygenate your tanks Easy to use and clean: squeeze out the air in the sponge when you put it underwater, then it will suck into water and keep down at the bottom; simply take out the sponge, rinse and squeeze it in used aquarium water, recommend to clean the sponges weekly and 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 and decor, fit any corner, great for shrimp tank, breeding tank, betta tank, nano tank, turtle tank, fry tank, goldfish, baby fish or other fish.