How much chlorine to shock at open?

[DanS]

CYA is 50, and the chlorine is now 2. The chlorinator manual (Clormatic salt chlorinator) recommends potentially higher cya of 50 to 70, but I've never understood why a chlorinator would cause a need for more cya, except that it does not produce chlorine with stablilizer. Any recommendations would be appreciated.

[JohnT]

CYA is 50, and the chlorine is now 2. The chlorinator manual (Clormatic salt chlorinator) recommends potentially higher cya of 50 to 70, but I've never understood why a chlorinator would cause a need for more cya, except that it does not produce chlorine with stablilizer. Any recommendations would be appreciated.

Are you talking about a salt water chlorinator? They normally need the higher CYA level to maximize cell life. It appears that the shocking action that occurs in the cell reduces the problems normally associated with higher CYA. Otherwise 2ppm is too low for your CYA.