@Patrick_B,
The pool opened 9/15/14, so it's pretty new - I haven't even had a chance to swim before the weather started changing! I'm using bleach (8.25%), Muriatic acid (31.45%) and baking soda to adjust levels since it opened based on the Pool Pal app for Android. It has a template for TFP recommended levels. My last measurements from about a week ago were as follows: Temp-53.0F, FC-1.5, pH-8.0. I added 38oz bleach and 21oz acid. I'm currently out of reagent for TA, but when I tested last time on Feb 1, it was 90. It seems like I add a lot of acid, but I expect that's due to the age of the PebbleTec...