I've been reading a ton of threads about people opening their pools to find ammonia, and 0 FC. I always thought 0 FC was to be expected, which is why the adage, "Open early, close late" existed, basically meaning that algae can't grow at less than 60 degrees. So with that understanding, I didn't think adding chlorine over the winter was needed. I mean for me, right now, my pool is under 4' of snow anyway, so even if I wanted to, it would be a nightmare of a project to get any in there. Plus, I have to believe I have at least 6" of ice in the pool. Maybe not, but I'm thinking there's something.
Anyway, are there other factors that contribute to the transition and introduction of ammonia? I read about it being the byproduct of something that might consume CYA. When my pool was closed, by the pool guy, my CYA was about 60. The previous year (when it was installed late in the season) it was probably 10 or less. I had no issue when it was opened last spring, and am hoping I won't have an issue this year when I open it. My father in law, whose had inground pools as long as I've known him (20+ years) has never talked about a problem with ammonia.
Is it less common than I think it is, and should I be doing something different than just bringing pool FC levels way up before closing, draining, and then winterizing for freezing?
There's tons of threads, but since for me it way too late (can't do anything till I open it anyway), I'm just trying to put my mind at ease.