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Total Chlorine
Chlorine in pool and spa water may be present in two forms. It is free chlorine
that does the hard work of killing bacteria and oxidizing contaminants. (When
you add a chlorine compound like Cal-Hypo or trichlor to your pool, you are
actually adding free chlorine.) When the free chlorine combines with these
contaminants, such as oils, swimmer waste and other organic compounds, it
becomes combined chlorine, or chloramines. In pool and spa water, this form of
chlorine has very little sanitizing ability, and no oxidizing ability. You can
think of combined chlorine as a spent bullet.
Total chlorine is just the sum of both combined chlorine and free chlorine. In
other words,
(total chlorine) = (free chlorine) plus (combined chlorine)
Knowing your total chlorine and free chlorine levels allow you to calculate
combined chlorine (combined chlorine = total chlorine minus free chlorine). If
the total chlorine level is higher than free chlorine, it is obvious that
combined chlorine is present. In that case you need to shock or superchlorinate
your pool or spa. To shock the pool, you add a free chlorine compound in an
extra large dose. The high dosage of free chlorine will actually oxidize
(destroy, burn off) the combined chlorine.
For more detailed advice on the chemical treatment of your pool or spa, contact
a pool care professional.
• Aquachek® Select
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• Aquachek® Pro 5-Way
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