I use this pump to provide flow to my Pentair UV Sterilizer so it is not the main pump for my reef tank although the return is in the show tank. The pump is very quiet, I haven't had any performance issues since I bought it. The speed selection works well, but the flow range isn't what I was hoping for. That said, I couldn't slow down the flow enough just using the controller settings. A ball valve had to be added to further reduce the flow to about 150 gallons per hour.
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