Lower pH or leave alone?

[JPMorgan]

I will close my pool on Sunday for the season. Recent tests show all levels within appropriate ranges. With pH of 7.8 and water temp of 55, I get a CSI of -.17. As water temp drops, Pool Math shows that CSI also drops. If I lower pH to 7.6, CSI drops even more. Should I just leave the pH where it's at and proceed with closing? Also.... what's the lowest water temp I should enter in Pool Math to get an accurate CSI for the winter months?

 

[Texas Splash]

As the water temps falls, the pH will rise. To some degree they help to counter-balance each other. TFP closing instructions state to lower pH to about 7.4 - 7.6 at closing which allows a bit of time for later when the water temps really crash, but allows for the pH to rise. As for a water temp in Poolmath, you might enter an average water temp are for your area based on the next 4 - 5 months.

 

[JPMorgan]

Thanks, Splash. I realized that I asked this same question on the Forum about this time last year... but I appreciate the "refresher". Dropped the pH down a little bit today. Should be good to go for closing on Sunday.

 

[anthonypool89]

Best way, I think, is to just monitor the pH and adjust accordingly over the winter.