Chlorine that is free and available to kill bacteria. Free chlorine is not combined with nitrogen.
The amount of chlorine available to kill bacteria or algae. Organic Wastes Wastes such as body oils, perspiration and sun tan residues which bathers introduce into the spa. Most organic wastes will not filter out and must be broken-down by shocking with an oxidizer ( SoftShock).
ppm MDRL = 4.0 0.90 0.07-1.40
The sum of hypochlorous acid and hypochlorite ions expressed in terms of mg/L or ppm.
The residual amount of chlorine left over after the chlorine demand has been met. This is the good form of chlorine.
The amount of free chlorine in the pool or spa water that is available to sanitize or disinfect the water. Free chlorine is sometimes called residual or available chlorine.
Chlorine that is able to destroy algae and bacteria.
The amount of chlorine still available for sanitizing purposes in your pool. This differs from the total amount of chlorine and must be tested for independently.
See free available chlorine.