Newbie to Forum...Looking for help

[PoolDoc]

You reported 2 sets of numbers:

alkalinity - 71 ppm
Hardness - 110 ppm

TA 90
CH 190

Both are on the low end of things. They are not too low, with a pH of 7.8, but they are too low for a concrete pool, if the pH is 7.2. I don't trust the pool store readings, but I've learned to be cautious about test results the first few times someone uses a K2006.

So, I want to you to keep the pH low enough so that we know for sure it's not REALLY 8.8, and then look at things again.