Hello all, we have a 12000 gallon free form in-ground gunite pool that is a little over a month old. Currently running a trichlor chlorinator and keeping an eye on CYA, will go to BBB eventually. Cartridge filter. The water has been crystal clear except for a couple of days after a huge storm blew through and filled it with dirt/ dust (it's cleared again since then). The chemicals have all been holding steady within normal range except for total alkalinity which has been running on the low side of normal (consistently testing in the 50 to 60 range). We were given a drop-based testing kit that tests for total Chlorine, PH and TA. We just got a TF100 kit and as mentioned above everything is within normal ranges except TA. Does adding baking soda increase TA and PH or just TA? We also have an 11' long waterfall and a grotto which is running 1-1/2 hours a day. If you need to see all the TF100 results I'll post them tonight when I get home. The water looks great, so I'm not trying to "fix" any water problems. Thanks!