chlorine drop

I wanted to bump up my calcium by about 80 or 100 ppm. I did so late at night, several hours after topping off the chlorine to 6 ppm. In the morning the FC was essentially 0 ppm. I added enough liquid chlorine to bring it back up to 6 ppm, then a few hours later it was around 1 ppm. Finally...

Hello — I shocked my pool last night around 8pm, added 56% cal hypo and some bleach, enough to bring the FC levels to 20 to 30ppm (getting rid of black algae). Brushed the pool good that evening twice. At 7am the next day (11 hours later), checked the FC levels twice taking samples from 2...