Is this something I need to be concerned about in winter? Our pool is open but we don't use it. CYA is at 100, Ph is 7.5-7.8 and TC is in the 5-10 range.
To add to what @ajw22 said - if you’re still using your chlorine feeder & pucks - stop or the cya will only climb higher thus needing a correlating higher fc level.
Stick with liquid chlorine if its too cold for your swg.
Also do the diluted cya test if you haven’t already- your cya may actually be higher than 100 & you’ll need to chlorinate accordingly.
Step 8
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