Which Return Pump for basement sump?

[sphelps]

Originally Posted by lastlight

I think GHL came out with sensors but if I'm remembering right they only went to 2000gph.

Yeah not much good for me really. Typically you can get good estimate on the flow rate buy timing how long it takes your sump to catch up after a shut down provided you know the volume of back flow but these pumps ramp up slowly. Another option is to drain your overflow and then shut your drain valves timing how long it take to full the overflow box but my pumps are in my overflow box so that doesn't work for me either.

I was looking at that pump curve previously posted, it really makes no sense to me. The slope shouldn't increase with more head pressure and it's apparently only capable of 5m of head yet the chart suggest it still do more than half it's rated flow rate at it's max head pressure. Maybe it's not showing up right on my browser, this is what I see


This is what a typical pump curve looks like