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Chlorinate on a weekly basis to maintain free chlorine levels at 1 to 4 ppm and kill bacteria.
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Clorox POOL & Spa Shock Plus Pool Chemical, Net Content: 1 lb, Bag, Solid, Odor/Scent: Chlorine, White, Compositions: Sodium Dichloro-S-Triazinetrione, Boron Sodium Oxide (B4Na2O7), Pentahydrate, Aluminum Sulfate, Flammability Rating: 0, Density: 1 g/cc, pH Range: 5 to 5.5
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