OK, after 4 inches of rain in a week my CYA fell to 50 on a SWG pool. It was a little low before the rain but now it's even lower. I do not have any CYA on hand but i do have a few tri-clor pucks left over from when we had an above ground pool. Think it's okay to use them, i have been adding clorine already as the water has been to cold( that will change soon) for the SWG to opetate?
Bonus question: Where is the water going during the rain. All i can think of is out the skimmer caps because there aren't any drain lines install. Then i thought the caps would float off, but maybe i'm wrong on that. I watched during a down pour to see if the pool would overflow but it fills until the bottom of the bullnose on the coping then stops. Then in two or three days it drops back to it's normal 1 1/2 inches below the bullnose of the coping.