Hi Tom,
I'm really interested in your post. I'm in north TX and am in my first winter with an open, uncovered and unheated pool. I've probably been too hesitant to drop my pump time but would LOVE to have the energy savings as long as I don't develop algae. Currently, I'm running 6 hours per day in 2 sessions (2+4) plus additional time when the freeze protection kicks in. My pool temp was 46 this AM and has been in the mid-40's most of December, with a low of 40 and a high of 51. Pool is in full winter sun, super clear, and with a chlorine demand running 0-1.0/day (SWCG off due to water being too cold).

When you do run your pumps for circulation purposes, how long are you running them?

Thanks for the help.