excellent - so if I take this one Pentair WhisperFlo

# 012485 - DUAL-SPEED UP-RATED 230V 60 HZ HIGH-SPEED 3450 RPM, LOW-SPEED 1725 RPM

* SF : 1.25
* Full Load Amps : 14.6/4.7
* Wt. : 42
* Model : WFDS-24
* Voltage : 115V
* HP : 1

it will suck 1.25 KW at full speed. I read somewhare that at the low speed it would be about 30% of that - is that the right ballpark ?

Thanks again for all your help

Patrick