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My pool will not hold a chlorine residual

November 16, 2011

Chlorine demand is the inability to keep an adequate free chlorine residual in pool water, even though the water is balanced and properly maintained. Chlorine demand is caused by various contaminants entering the pool that increase oxidation levels or tie up free available chlorine and is normally encountered when you first open your pool in the spring. Symptoms can include slimy pool walls and cloudy water, although water can still be clear and still have a chlorine demand. Chlorine demand can be caused by a heavy bather load, inconsistent maintenance, or external sources such as fertilizers (nitrogen contamination), pesticides, and rain/pollution.