My understanding (although being a newbie I could be wrong) is that once we properly close our pools here in the freezing midwest we don't touch them again until spring. I'm sure it's different in NC with your much warmer winters.

So my question is assuming I properly close my AG pool will CYA be signifantly impacted by the winter (reduced from current 100 level)? or will I need to drain and fill to get my CYA down?

Thanks Again