Standard dimmer switches are not meant for use with motors. There are dimmer switches for fan motors that might work. They work differently from light dimmers, and are more expensive. The ones I have in my house have three speed options, not like the infinitly variable style of light dimmers. I'm not sure if they would do the job for a PH though.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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