The Marineland Siphon Kleen cleaner is a perfect tool for regular water changes, because this double-duty cleaner siphons as it removes grungy waste buildup from aquarium gravel, leaving the gravel bed open to oxygenated water flow and increased aerobic bacterial action. All Siphon Kleen models are designed to draw water at a velocity proper for ensuring that grunge, and not gravel, is removed. The size of the barrel and hose diameter determines the amount of water removed.