I have a 22k gal SWG pool that is 6 months old. I typically need to add half a quart of muriatic acid per week to keep the pH in the 7.4-7.6 range. Is this normal?
I understand that with a SWG, there is also production of sodium hydroxide which raises the pH, and that new plaster interacts with the water in releasing calcium carbonate and calcium hydroxide which also raises the pH. Is the amount of pH rise that I'm seeing and the muriatic acid correction that I need within the normal range?
On a related topic, during my weekly brushing of the pool there is still a noticeable amount of "plaster dust", even after 6 months. For my pebble finish, how long should I expect for it to completely "cure", and does the presence of plaster dust at 6months indicate that the finish is still not completely cured?
Today's chemistry: FC=1.8; CC=0.2; pH=7.4; CH=260; TA=100; salt=3,600