Need some math done please

[aylad]

You can tell if it's normal or not by testing at night after the sun is off the pool and again in the morning before the sun hits the pool. If you lose more than 1 ppm chlorine during that time, it's not normal.

Janet

[shub_31]

Im confused. Everyone says to add chemicals at night so they can work. If thats the case shouldnt you drop ppms every night based on swimming in it.

[kelemvor]

The reason to add chems at night is to avoid the sunlight. Sunlight will consume chlorine, the ammount burned up by the sun can be reduced by adding cyanuric acid. At night, you don't have the sunlight concern so all that chlorine you add can work to sanitize until the sun hits it in the morning.

Swimming introduces sweat, bacteria etc so that does consume some chlorine as the chlorine sanitizes away these things. I don't know how you could measure how much, though.