MULTIFUNCTION: performs three functions at the same time :water filtration, water circulation and aeration
RECOMMEND TANK SIZE: Up to 40 Gal, Max Flow Rate: 450 GPH
UNIQUE FILTER SPONGE: This bio-sponge conducts both mechanical and biological filtration.
DUAL USAGE: works as a stand-alone power head or an internal filter
Fully submersible, Suitable for both freshwater and saltwater use. (Note：It should be totally submerged in water when working.)