Marineland Penguin Powerhead

Undergravel filters perform best when water flow through the gravel bed is consistent and predictable, creating surface agitation for tank oxygenation. Air pumps and airstones can deteriorate or clog. As a result, they become noisy and ineffective... Frequently requiring replacement and/or service. Penguin power heads deliver constant flow with fully adjustable aeration and increased surface agitation... And they remain silent at all times. The air valve regulates air flow, the air filter eliminates noise and dust and the intake strainer keeps debris from fouling the impeller... That's efficiency!... Penguin power heads are absolutely safe in both fresh and saltwater.