Quote Originally Posted by aylad View Post
Since your chlorine has been way too low, I suspect that algae is the problem. You can verify this by testing for chlorine at night and again in the morning, to see if you're losing any chlorine overnight. At any rate, the answer is to add chlorine, and lots of it. With a CYA over 100, this means taking your chlorine level up to 25 ppm and holding it there until the pool clears up, and until you're no longer losing chlorine overnight. At that point you can let the chlorine come back down, but with your CYA that high, you can't ever let it come down below 8 ppm.
I don't see your results in the pool chart, so maybe it didn't save. When you get a chance, could you please fill it out again?