My new pool was pebble plastered 4 weeks ago, but not acid washed before filling. The pool builder added some acid after it was filled and told me to brush it. I have had no instruction since then and I'm getting worried that I should be doing something. I bought a test kit and PH is 6.2; TA is 0; chlorine is 0 (never had any); calcium is 1000. I am running a Pentair 4x160 pump on speed 2 with a Pentair 520 cartridge filter in a 12,000 gallon freeform pool. What should I be doing besides brushing?