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The chlorine which has not combined with other things in the water like
algae or bacteria. This chlorine is what is still available for
sanitizing your pool and is also known as the chlorine residual. It is free, available chlorine that does the
hard work of killing bacteria and oxidizing contaminants.
Combined Chlorine
When the free chlorine combines with these
contaminants, such as ammonia, soap and other nitrogen-containing
organic compounds, we call it combined chlorine, or chloramines.
Total Chlorine
The sum of both the free available and combined chlorine.
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