Split from HERE. Please start a new thread to ask questions and not revive a 4 year old thread. Thanks, jblizzle
After reading this whole thread (which was incredibly interesting), I still don't understand a few things...
So CYA slows the loss of chlorine. I get that. But you need MORE chlorine as your CYA levels rise. Wouldn't it be the inverse? If CYA reduces chlorine loss, you would need less. That's what my gut would think.
I read that some of the FC binds to the CYA, so is it unavailable to sanitize. Right? Is that why you need more as your CYA rises? You really aren't "raising" the level of chlorine available to sanitize, but offsetting the amount "wasted" to being bound to the CYA? Basically your FC = Chlorine to sanitize + chlorine bound to CYA?? Something like that?
If so, why would you not want to keep your CYA levels low then - just enough to have the benefits of stabilization, without requiring excessive bleach dosing or SWG usage. I think it was mentioned that that is a goal, so why then, with a SWG vinyl pool, are recommended levels 60-80 for CYA, but about half of that for non SWG vinyl pools? If SWG pools seem to stay clear of algae at lower FC levels, wouldn't it make sense that you could have less CYA?
I'm a bot confused. Sorry if my logic as to why I'm confused isn't clear.