35,000 gunite pool. Sand filter.
A week ago, the water was crystal clear and all chemistry was good except Ph and TA were way high and off the scale. I went to the TFP calculator and entered the info. The calculator instructed adding 64 GALLONS of Muriatic Acid. Fortunately, Home Depot only had 34 gallons and that's what I added. Stupid, I know. So I went from WAY high to WAY low. I have been adjusting ever since and I would now estimate the Ph is a little over 8.2 and TA is now at 180. BUT, in the interim, the pool turned green over night Tuesday of last week. I added 18 gallons of 8.2% bleach, but that did not help. So I added a gallon of Sam's Club Member's Mark Algaecide 40. No help. And I have brushed and vacuumed numerous times.
In frustration, I took a sample to a pool supply place. They sold me 4 small packets of Poolife Mustard Algae treatment along with ph adjusters. Still green. Back to pool place and they send me home with 1 1/2 quarts of Algaekill II and tell me the sand filter could be an issue. Algaekill II was no help so I add ANOTHER gallon of Sam's stuff. Still green.
I have shut off the pump and more dead algae is on the bottom of the pool. Will vacuum and brush again, but at this point, it's safe to say the water will still be green.
Current readings: Ph >8.2. FC: 7. CC: 6. TA: 180. CH: 225. CYA: 45.