Ideal CYA, PH and TA when closing a mesh-covered pool


Active member
Oct 17, 2018
Southern Kentucky
What is the ideal CYA, PH and TA level when closing a pool with a mesh cover that typically has to be drained 4-5 times over the winter to keep water level below the tiles all winter? Last year I opened up to a swamp with 0 CYA, low TA and high PH that took a long time to clear up so I need to know what the ideal CYA, PH and TA would be to prevent this from happening again. Right now, CYA is 30, PH is 7.8 and TA is 70 but I can adjust those before closing if it might help.

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
Texas, San Antonio/Marion, South-Central Area
Pool Size
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
While a variety of factors contribute to changing chemistry over the winter, a CYA of ~ 50 should work fine and allow for some occasional water loss. TA is probably the least of your worries as it doesn't really impact your overall chemistry too much. As long as the TA is anywhere between 50 - 100 you're good. The pH is typically lowered to about 7.4 - 7.6 which allows time for it to rise later as the water gets cold.

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