CYA was measured with the Taylor Test Kit and looking until the Black Spot disappears. The Pool place got 50 using test strips .

Understand to use the bleach so this means daily check of chlorine level and then based on reading add bleach with each gallon expected to raise my ppm by 2.5

Is there a better time to add the bleach? I normally run pump from 7am-7pm and the swimmining usually is from 2-6 but normally only adults doing laps. I understand need to keep higher but like this weekend grandchildren will be here. Whats the safe limit for them to swim-upper ppm level -----thanks again