heavy use can destroy all the chlorine in the water unless you take preventive measures by
adding an extra dose before swimmers arrive. Even then, the supply may have to be replenished
at the end of the day to restore the residual level.
Superchlorination
Superchlorination involves adding
5 to 7 times
the normal dose of
chlorine to pool water to burn out nitrogen compounds and human
wastes.
Superchlorination must be done when the combined chlorine
reading is higher than .2ppm, or about every 2 weeks during the
swimming season. Superchlorination should be done only after
sundown, since the UV sun rays are likely to destroy some of the
chemical. Close the pool to swimmers until the residual level drops
to normal: 1.0 to 3.0 ppm.
Chlorinated isocyanurates
are the chlorine compounds with cyanuric acid base. These are the
most popular and easy to use forms of chlorines. These chlorine compounds are easy to use,
dissolve readily, leave no calcium residue to damage filter media, and do not appreciably alter
the pH. They’re available in tablets, sticks, or granulated form.
Continued use of chlorinated isocyanurates may cause the cyanuric level in the water to increase
over a period if water is not discarded by backwash or splashout. If the cyanuric acid in the
water tests out at over 100ppm, the pool may have to be partially drained and refilled with fresh
water. Your pool service company can test the cyanuric acid level in the pool.
The granulated type of fast dissolving chlorine may be added directly to the pool and is
particularly good for spot treatments of clinging algae.
