Quote Originally Posted by hulla
Just tested some more...

CC 2.2
FC 0.6

Why does tap water have more chloramines than the pool? Where does all the combined chlorine in the pool disappear to?
Many municipalities add ammonia with the chlorine used to sanitize water to prevent the formaton of trihalomethans like chloroform, which are suspected carcinogenics. This addition of ammonia favors the formation of monochloramine. When you shock your pool you destroy the choramines.