Hi Larry,

As a former Wauwatosa and Milwaukee resident, I know how hot the 90s can feel!!!

Now I live in a place where we've been in the 100's for a few weeks with no change in sight. My pool water is routinely in the mid- to upper-80's and has, upon occasion, broken 90 degrees.

I run my pump overnight and also my waterfall. Running any water feature overnight, like a fountain, will do the same, effectively dropping the temperature of the water. With overnight lows here in the upper 70's, I can lower my pool water temps at least 4 degrees by this method.

I have no experience with solar covers, but I know I wouldn't cover my pool if I were in your situation...I'd WANT the water exposed to the cooler nighttime temps, at least during a heat wave. Sure some evaporation takes place, but probably more evaporation happens during the day in the sunlight and higher temperatures.

Enjoy your pool while you can.