I have the same issue as this topic. I do use a waterfall at times, but am constantly chasing PH and TA. My TA drifts down to 40 every week, I stopped raising it as much per another threads recommendation. I used to push it to 90/100, now I just keep it 40-60, but I still fight the PH always at the top of my color scale (8.0 +) I have a 2 yr old 16k ga. plaster pool and add a qu of MA every other day with my bleach. It keeps everything in check but seems like a TON of acid every month. Someone wrote to ignore PH and focus on TA, I've also see it the other way around, what would you recommend?