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Hagen Power Head 201 Power that moves you - Adding a powerhead to an undergravel system increases water flow through a gravel substrate and improves its filtering efficiency. It also oxygenates water and, in the process, provides needed oxygen to colonies of beneficial bacteria in the gravel which optimizes their biological filtration capabilities. Output without air 126 U.S. gal/hour (476 l). Output with air 110 U.S. gal/hour (416 l). Recommended aquarium 1PH (75L) / 20 U.S. Gal. 2PH (150L) / 40 U.S. Gal. U.L. Available.
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