I have been using the BBB method for several years with great results, however this year I can't seeem to regulate my PH. My pool is 12,000 gal, inground, plaster, Haywood cartridge filter.
Readings using drops based test kit are as follows:
FC = 5.0
CC = 0
PH = 7.8
TA = 100
CA = 750 ( I know it's very high, but refill water is 400, so it has always been high)
CYA = 50
TEMP = 84 degrees
PH will rise about .2 ppm per day. Last year and the years prior to that, one gallon of acid would last me more than a full season. I have already been through 3 gallons this year between the lowering of TA last month (low PH and aeration method) and PH regulation. I thought that lowering my TA from 140 would make a big difference, but it didn't.
Don't know whether this has any effect, but pool is 12 years old, plaster is quite rough and will probably be replastered after closing this year. I am totally stumped as to why PH is such a pain.