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Originally Posted by psychofunk
This is not bad for the pump though is it? Is there perhaps a better way to reduce the speed (noise) of the pump then using the variable transformer. Or am I just better off running the pump on good old american 120v house current?
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Naah -you are fine (within reason). Increasing motor slip would normally increase motor current which increases torque which is why we use ac motors in industry -they inherently try to maintain constant speed. But since you are increasing motor slip by reducing the operating voltage your input (and output) power is reduced and the decreased impedence is offset by the reduced voltage. So the motor should not overheat.
Now -if the pump is fan cooled then excessive speed reduction will not allow the pump motor to cool properly and motor temperature will increase. You will just have to be the judge of that -just see how hot it gets.