So, as I mentioned in my previous post, I have been doing partial drains and refills to lower my CYA as I start in on the BBB method. I have now gone from 200 down to 80 with my CYA. Yay! Here's the problem though:
I mentioned that my TA was climbing rapidly as I did this. I did wait until my FC levels were at 7 and then retested TA. It still came out at 225. Out of a hunch, I decided to test the water from the hose that I was refilling with, and lo-and-behold; the refill water had TA of 240! I then jumped on the computer and checked the water analysis for our city, and sure enough, the last test showed TA at 245. Now, every site I've looked at considers this a normal range for tap water.
So first question is does every person who refills their pool have to deal with high TA?
Second question is: do I need to lower my TA? And to answer the question of whether it is causing a problem, I have this data: we do have calcium deposit lines at the water level on the boulders that surround our pool. Other than that, I haven't had any major issues with calcium. As far as PH drift, the only real data I have is that I went away for six days last week, and while I was gone the PH rose from 7.4 to 7.8. That was with my wife adding about 1/3 of a gallon of bleach each day.