Power head speed control

Yup, those will not work with 99.99% of the motors out there.

They work with drills, and routers because drills and routers are typcially universal motors :). You powerheads and pumps are typically shaded pole synchronous motors....
 
the electronics within these type of speed controls are not based on reostats, rather voltage regulators and need a commutator to control the motor as the above post suggest.
 
I guess I should have added, that to control the speed of a synchro motor... you need to vary the frequency or use PWM... Much more expensive and much more complicated.
 
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