Ben,

Yes I'm aware that lower pH makes chlorine more effective at sanitation. But I'm also concerned that at high FC levels, the pH test can appear higher than it is. Adding extra drops of 0007 can compensate, but 0007 itself affects pH, too, correct? I've forgotten whether it's acidic or basic.

So, given that, I took that leap that if someone's FC is 15, a pH in the 7's is probably OK (since the CYA is moderate).

Carl