AC pumps and UPSes...

[RonnieG]

I just discovered today that my pumps don't work when on UPS. Apparently the pumps don't work on the modified square wave output of the UPS :bang head

[NavyDood]

Huh? What kind of pump do you have?

[muddocktor]

That's strange. My Eheim 1250 has been running off a UPS for years and years with no problems.