Chlorine shock

[gillianb]

How much chlorine per liter do you use to shock?

[Strannik-au]

depending on your CYA level. you should aim for 10% of CYA

[chem geek]

If one is shocking to get rid of algae, then the target FC level for shocking is around 40% of the CYA level though at high CYA levels this isn't so practical. You can use this chart as a guide.

You do not normally need to shock your pool if you maintain the chlorine level consistently. You only need to shock if there is visible algae or dull or cloudy water or measured Combined Chlorine or a known "accident" (discharge or dead animal, etc.).

[Strannik-au]

oops, my mistake, don't know why i put 10%, must've been too sleepy