I bought 2 of these for my reef tank. Pros: Really wide chaotic flow. Good mounting options. A simple but easy to use controller. With 2 pumps mine are set up as master/slave and take turns with only the master needing to be adjusted. Cons: Noise is average. As in I still use them but they are verifiable. I have a smaller SLW-20 and it's almost silent. In C mode I get a nnnnnnnnrrrrrrrrrrrrrrrrr nnnnnnnnnnnnnnnnnnrrrrrrrrrrrrrr nnnnnnnnnnrrrrrrrrrrrrrrrrrr.
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