This pump works better than my previous pump EXCEPT when it's too hot outside. I use an outdoor scrubber to aerate my carp pond and it produces a good amount of air and is fairly quiet. The downside is that it stops pumping when it's over 90F outside, but will start up again when it cools down. I originally had mine under some artificial rock covering some of my other pond stuff and when it got around 80F outside it stopped. So I built a small case for it with a lid to keep the rain out and mesh sides to let in cooling air and it works fine - until the outside temp hits 90F. It gradually drops between 80 and 90 F and then completely stops downloading. It's fine for me in Washington, but I wouldn't recommend it for outdoor use in, say, Arizona.
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