Hi, John,

Thanks for posting the numbers.......very helpful.

Reading between the lines, I sense you have lost faith in chlorine's ability to solve your issue. That's fine and I understand. I would make two points:

1. You need to manage your parameters more closely. I would not run my pH nearly as high as you do. 7.2 -7.6 seems best and many feel Cl is more effective in the lower ranges.

You do not have nearly enough CYA in there to maintain shock levels unless you are adding Cl every hour or so.

2. If you clear your issue with something other than Cl, what do you intend to change to keep it from recurring? It seems to me that your problem will simply return unless you get a handle on what is causing it in the first place.