@Not4You,
I was in the same boat about 3 months ago, with CYA in the ~200ppm range. And as it was July in Phoenix, I was even more concerned about letting my plaster dry out. What I did was start pumping water out as soon as the sun went down and let it go until I was ready for bed. Depending on how late I stayed up, this was about 6-9 inches of water each night, which if I remember correctly was about 15% of my total water each night. When I went to bed I shut off the pump and turned on the hose to help refill the pool faster than the autofill could. I did some preliminary checks/measurements to see how fast it pumped down and how fast it filled back up with the hose to ensure I was not going to overdrain or overfill it in the time that I had. Since there was no direct sun, and the water was only a couple of inches below the tile I figured it wouldn't dry out quickly enough to cause damage.
For my pool, this 15% per day took about 10 days of doing this to get my VYA from 200ppm down to about 40ppm, and ended up taking about 20,000gal of water for my 13,500gal pool. But in the height of summer, that was about my only option, and even with that much water swapped out, my bill only went up about $40 from normal. With the current lower temperatures and shorter days I'm sure you could even be more aggressive with how much water you exchange each day. Good luck!
I was in the same boat about 3 months ago, with CYA in the ~200ppm range. And as it was July in Phoenix, I was even more concerned about letting my plaster dry out. What I did was start pumping water out as soon as the sun went down and let it go until I was ready for bed. Depending on how late I stayed up, this was about 6-9 inches of water each night, which if I remember correctly was about 15% of my total water each night. When I went to bed I shut off the pump and turned on the hose to help refill the pool faster than the autofill could. I did some preliminary checks/measurements to see how fast it pumped down and how fast it filled back up with the hose to ensure I was not going to overdrain or overfill it in the time that I had. Since there was no direct sun, and the water was only a couple of inches below the tile I figured it wouldn't dry out quickly enough to cause damage.
For my pool, this 15% per day took about 10 days of doing this to get my VYA from 200ppm down to about 40ppm, and ended up taking about 20,000gal of water for my 13,500gal pool. But in the height of summer, that was about my only option, and even with that much water swapped out, my bill only went up about $40 from normal. With the current lower temperatures and shorter days I'm sure you could even be more aggressive with how much water you exchange each day. Good luck!
