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Definitions:
Algae
Plant-like organisms which grow in water. Especially active in summer
conditions, where chlorine disinfectant level is too low to destroy them.
Algae may be green, brown, pink, or black (Black Spot) in color.
Chlorine Demand
The amount of chlorine that should be added to the water to provide
proper bacteria and algae control.
Chlorine Residual
The amount of chlorine left over, after the “demand” has been met.
Combined Chlorine
Weak chlorine which is combined with the contaminants in the water.
Free Chlorine
Active chlorine in the water with the potency to destroy contaminants.
Shock Treatment
The removal by means of oxidation of those materials that have
chlorine demand.
Superchlorination
An extra large amount of chlorine added to the water.
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