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I haven't turned them on and off a whole lot, but for some reason they seem to start the correct direction every time stock... I don't really get it. There is no stopper built in...
With the modified impeller they start the wrong direction usually, but when you start them out of the water and then put them in they run the correct direction. I think if you make a stopper like people do for MJ mods the modified impeller will switch to run the correct direction.
Personally I don't see the value of wavemakers... so it's not a concern for me. I point all my pumps at each other and the result is widespread random turbulence (which is what we are going for).
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