I installed it and at first it was quiet producing very small bubbles. Then one day one of my little catfish Cory got caught in the water intake and died. From that moment on, this thing got really noisy. Even after I removed the impeller, cleaned it, and reassembled it, this thing was so loud I could hear it in the next room. Maybe I was unlucky and the device got damaged? The instructions weren't in English by the way, but not what you need - very easy to install. I have to say this thing has the best suction cups I've ever seen and I could reuse them on my radar detector.
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