Sustain Summer Shield Chlorine Extender is the brains of the Sustain System. It's not only smart, but unique to PPG, protected by a U. S. Patent. Summer Shield Chlorine Extender combines with some of the chlorine in the pool water and shields it, thereby creating a reserve tank of chlorines to give extra protection against the development of algae.
As Free Available Chlorine (FAC) is depleted, the shielded chlorine releases into the pool water to control algae and bacteria growth. Sustain Summer Shield Chlorine Extender provides chlorine-killing power despite unpredictable increases ins chlorine demand brought on by debris from rain and wind storms; or when your nice quiet swim turns into a full-blown neighborhood pool party.
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