Capable of filtering up to 90 gph with adjustable flow rate. Built in self adjusting surface skimmer for cleaning the water surface and promoting gas exchange. Requires no extra plumbing. Uv sterilizer helps eliminate unwanted algae blooms and free floating parasites. Includes replaceable filter pad enhanced with aquatops bamboo carbon. Suitable for fresh water and salt water aquariums up to 25 gallons. L x W x H: 9.4 x 6.5 x 6.6