Thank you both for your observations. I am still hoping to hear from folks offerring pointers on how to estimate electricity savings, if any. It sounds like the pump is run on low for long periods of time, so I am not sure that actual power use is lower. I want to make sure I will be able to see a difference in my electric bill before proceeding.

My cleaner operates on the suction side, so it sounds like it won't run on low, which is fine, I can put in a valve controller and turn it off completely on low so all return is via skimmer and drains, and set it to optimum flow on high. The controller will just have to have a stop set in the optimum flow place. I hope they are available that way. It loooks like a little experimentation may be needed.

Our electricity is mostly natural gas based, so the prices are just getting higher and higher with no end in sight.