Thanks! Now if I could just get the same info - including low speed - for the PowerFlo SP15922S. I suspect the "Power-Flow II" and "PowerFlo Matrix" tables and charts all have very similar numbers, but I don't know that.

I'm worried that the SP1750, when the vacuum hose and vacuum head are attached, will not have enough flow to vacuum the pool floor. I don't know how much additional head the vacuum adds and I don't know how much flow is needed for vacuuming. I have this head

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

If the SP15922S on low has performance similar to the SP1750, and it won't vacuum on low, I can turn it on high, then throttle the flow as necessary.