Pool is about 3 weeks old. For the last 10 days or so I've kept the water nice and balanced. Typically FC 4-6, ph 7.5, TA 80, CH 350, CYA 50, Borates 50. The plaster company was just leaving when I pulled in today. I THINK they were here looking at parts of my plaster where they didn't do a good job exposing the aggregate. That or cleaning plaster residue off the water line tile. I didn't get a chance to ask. What I did find however is that they jacked my chemistry. Apparently they added a bunch of acid. I came home to find my pH at 6.4 and TA at 40. Should I just let both rise on their own? Being new plaster the pH comes up pretty quick.