Dimmer Switches

[Gizmo]

You can get "Industrial dimmers" or "electronic dimmers" if you are worried about frequency. All a power head is, is a motor. and a very low power consumption motor at that. I would never recommend trying to dim your 3000GPH Spa motor, just a bad idea. But as far as power heads go, I cannot see a problem using a standard home dimmer rated at say, twice the wattage of a powerhead. P.S. I've worked as an electrician for 4 years, we used standard home dimmers to control the speed of fan motors all the time.