Powkoo Sponge Filter Aquarium Double Review

Powkoo Air driven sponge filter, work great without noise, provides aeration, oxygenation and filtration in one, which can ensure the excellence of the water quality, perfect for freshwater and saltwater【Fits fish tank size: 15 to 35 gallon】. Sponge filters provide both mechanical and biological filtration - Traps floating debris and protect your baby fish from being sucked up into the filter, aerobic bacteria colonize the sponge providing a bacterial substance to facilitate the nitrogen cycle. Double 9-layer ribbing shape sponges design, it quickly established a bio-filter and extra oxygen, two sponges means more surface area for beneficial bacterial to colonize and faster cycling, keep your fish tank crystal clear and clean. Easy to use: simply connect an airline tubing and an air pump into the unit, with a check valve on the air tube to prevent water return to the air pump. The air-water outlet is adjustable so you can change direction and height of the water flow. Comes with two suction cups, can be installed anywhere and can be easily hidden on the back wall of the aquarium; perfect suitable for shrimp tank, betta tank, breeder tank, goldfish, fry or other fish.