This is a powerful unit. The specifications indicate 7.8 l/min. Although I haven't done any tests, I can subjectively say that it produces a lot of air. The specs also say it's quiet. Well, maybe it's relative to air volume. Mine sounded like a lawn mower. (Perhaps a bit of an exaggeration.) I may have received a defective model. If noise levels are tolerable in your situation, this is a great device at a very reasonable price. Unfortunately I had to send my device back. My aquariums are in the living room of my bedroom. The noise level was too high. As the song says, "I can't do it. I can not
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