I am getting frustrated with the pH in my pool. Last weekend I brought it down to 7.2, aerated and got the TA to 80 from 120. Now 5 days later, it is back up to 7.6 and TA is 110. Every time I add liquid chloring 12.5%, the pH rises about .2. I did add about 4 inches of fresh water. I tested my tap water and the TA was 180. Should I just resign myself to pH rising and add MA routinely at 7.6 to stay on top of it?