I hear you waste

I also trust the chem experts here but I really would love to see more evidence. The SWG manufacturers must have that evidence to support their recommendations right? Where is it?

I use a SWG and currently have my CYA at 40. The SWG is on its lowest setting and is maintaining Free chlorine very well, maybe it could do better but I've been watching this thread before I add more CYA.

I figure if my pool is sparkling and my SWG isnt dying I'm ok. I can always add later if I become convinced that a high CYA is really superior.