How much chlorine to shock at open?

[aylad]

Also when you shock a green pool, usually one addition is enough to see a difference but not enough to clear it. You need to add more bleach to your pool 2-3 times daily, enough to bring the chlorine level back up to your shock level (which is why you need the test kit), until it completely clears up. Keep the filter running 24/7 during the process, also, because the chlorine will kill the algae, but the filter is what will remove it from the pool.

Janet

[DanS]

The pool water is clear now - the chlorine level is still above 10.

[aylad]

At this point you need to know your CYA level to know where to maintain the chlorine.

Janet

[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.