Shock is the level of chlorine in the pool. You just need to add enough chlorine (shock) to raise the FC to the level you want (in your case 15 ppm) so just add enough to raise it 10 MORE ppm.
Amir
Re: Shocking
Shock is the level of chlorine in the pool. You just need to add enough chlorine (shock) to raise the FC to the level you want (in your case 15 ppm) so just add enough to raise it 10 MORE ppm.
Amir
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