NO, NO, NO! WAY too much! A gallon of 15% sodium hypochlorite will add 6.5ppm of chlorine. Adding 12 gallons of it will add 78ppm of chlorine! Way too high! I hope you haven't done it yet. (Hopefully, it is has degrades and is nowhere near the 15% it is advertised to be.) Where did you get that amount to add?
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