I'm confused on what the right PH level is. The Pool School says that 7.7 - 7.8 is ideal, but consistently I see people in threads saying to maintain it at 7.2.
Is 7.2 just for SLAMing, and the higher PH for normal use? FWIW, I've been keeping mine between 7.5 and 7.8 with about a cup of acid a week (and raising TA to 100 when it hits 80).
Also, in general, why do we want PH slightly basic rather than neutral?