I just ordered them for seawater or aquarium mixing. I'm so glad I didn't really try to use them in my tank all the time. After using it once for about ten minutes it stopped working. You could hear and feel the engine running, but it wasn't turning. I unplugged it and plugged it back in and it worked again. But now every time I use it it stops and starts again. I knew it wasn't going to be a super quality product because it was really cheap, but I think it will work fine for mixing my water. You get what you pay for.
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