What’s the difference between “total” chlorine and “free” chlorine?
Total chlorine is the total amount of chlorine in the water. When chlorine binds up with contaminants it forms a compound called “chloramines” that are still part of the total but no longer effective. The chlorine that is still active to remove contaminants is known as free. When the chloramine level is higher than the free chlorine level (subtract free number from total), then you need to shock the water.
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