I have both versions. I used the 538 GPH version for my IM NUVO40 AIO tank as a back pump. I know I use it in my large aquarium to run a UV sterilizer. I use the smaller one on my IM NUVO10 AIO and it's perfect for a reversible camera. Both pumps are silent. I hate the sound of the pump and am currently 10 feet from this pump and can't hear anything. The controls are easy to use. Mine came "blocked" which confused me for a minute but after reading the manual I figured it out. I've heard these pumps don't have a high head, but I've never tested it. To be honest I think they are for the IM All-in-One line.
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