When to shock

[paulbest]

Shocking your pool is a great way to remove organics in your water, kill off algae, and be sure your pool stays clear during the swimming season. However, when you shock a pool, you essentially limit the time you can use it as you must wait for the chlorine levels to drop to 3-4 ppm before it is safe to swim.

If you keep your pool at the proper chemical balance, you won’t have to worry about shocking your pool. But if your pool’s chlorine levels drop too low, you will need to shock your pool to raise the chlorine levels to ensure a safe swimming environment.

[Denniswiseman]

You can swim up to the correct shock level relative to your CYA if your FC is holding http://www.troublefreepool.com/content/128-chlorine-cya-chart-slam-shock