I have a 20,000 gallon inground plaster pool, with chlorine system. I have had some trouble with green algae. Now, I cannot get my levels stabilized. Two days ago, I drained 25% of the pool. Today my levels are:
Total Chlorine 0
Free Chlorine 0
Total Alkalinity 90
Calcium hardness 400
Cyanuric acid 125, maybe higher, it's off my scale.
In past few days, i have put over 20 lbs of shock, in the little bags. I use 3" stabilized pucks, and have to replace them every week. I think that's were the stabilizer is coming from. This all started when I first noticed a little green algae, and my Chlorine level was zero. I can't seem to get it higher.
Please help me to balance my pool, I am desperate.