Can someone please explain the chemistry or technical reason why more CYA is recommended for SWG pools than for regular chlorine pools? I was in the pool store today looking for a leaf net and asked the guy about it just to make conversation and he said that he had never heard of that. I didn't challenge him on it or anything and just thought to myself that I was being pool stored. Anyway, even Hayward has on the cabinet of there SWG that it is supposed to be 60-80. So, why? Chlorine is chlorine right?