Chlorine needs to be present in the pool at all times.  It reacts instantly with waste products to sanitize and protect your pool water.  The more waste you dump into your pool the more chlorine is needed.  The amount of chlorine used by your pool or spa is referred to as "Chlorine Demand".

All chlorine types disassociate in water into hypochlorous acid [HOCl] and hydrochloric acid [HCl].  Hypochlorous acid is the active sanitizer.  Also referred to as "Free Chlorine".  Bromine chemistry is similar except hypobromous acid [HOBr] is the active sanitizer.

The filter eventually removes most of the solid chemical waste by products.  Some of the by products are gasses and are released into the air.   Notice that several of the by products from chemicals and waste remain in the pool and build up over time.  The major portion of this build up is referred to as "Total Dissolved Solids" (TDS)

Perfect Pool and Spa Software! Users: Input test results into main screen.  Follow directions as indicated.

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