The Micro Clean 304 is a fully submersible internal filter for fresh and saltwater aquariums and turtle tanks up to 15 gallons. The filter provides mechanical and chemical filtration with easy to replace filter cartridges. The flow rate is adjustable from 30 to 55 gph and uses just 4 watts. This internal mini-filter includes 3 small suction cups for mounting and a water diverted. It can be placed in the tank horizontally and vertically. When placed in the tank horizontally the diverse outflow can be used with the included water diverted to form a fountain or 1/2" tubing can be used to create a small waterfall. Info from the Aquarium Guys