Total Chlorine
Total chlorine is the sum of free chlorine plus combined chlorine in swimming pool water.
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Free Chlorine
Free chlorine sanitizes and oxidizes swimming pool water, keeping the water safe and clear for swimmers.
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Superchlorinating (shocking)
Superclorinating (shocking) a pool is the process of adding shock material into the pool water to meet or exceed chlorine demand, resulting in clearer pool water.