Bromine Chemistry Question

[FormerBromineUser]

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I'M GLAD YOU ARE THERE, Ben !!!

The only other question I can think of before you get my <150 results is:

3. After waiting 3 days (after a TA reading < 150 ppm), retest both pH and TA, and report results here. Do NOT test either pH or TA during the 3 days you wait.

I know I can't test pH, so I am wondering how I know when to stop aerating.