I have used the BBB method for 2-3 years with great success. I have been out of town for awhile and neglected my pool and come back to a green cloudy mess. My PH is sky high..at least 8.2 by my test kit. I have a 27000 gallon vinyl. My question is how much acid to add to it to get down in the 7.5 -7.7 range?

Thanks