what speed on a variable pump?

[cleancloths]

The pump (at least mine) has a mode where you can set the GPM flowrate. So if you set it at 10 or 11 gpm that will give you one turn-over of 14,500 gallons in 24 hours. If you are on time-of-day electric rates (as I am) you might want to run it more at night and less during the day.

[mas985]

Only the VF has the flow rate mode so it depends on the Intelliflo model. But with single line 1 1/2" plumbing, the flow rate should be close to:

Flow Rate (GPM) = RPM / 48

I would set the pump at 1000 RPM because that is the most efficient setting. Then run the pump for a turnover, ~12 hours, per day to start with and see how that goes.