I've searched on the forum and pool school and can't find a consensus.
When is the best time to test the pool water and add chemicals? Morning? Evening? Before swimming? After swimming? When the pump is running or does it matter? Is consistency more important than time of day?
I've been testing daily but at random times. Depending on my schedule, sometimes first thing in the morning, but usually late in the evening. But in the evening my pump isn't running because I only run it during the day.
I figured it is best to add chlorine (I'm using bleach) in the evening rather than when the sun is out to try to keep the FC level up as long as possible. BTW I did an OCLT and my FC was 4.0 at night, and 3.5 in the morning, so that looks good. CC was zero in both cases.