Excessive chlorine loss
What is it?
The consistent inability to maintain chlorine levels is also called “chlorine demand” and is most often caused by a high level of inorganic and organic contaminants in the water. Those contaminants force the chlorine to work extremely hard to oxidize them, leaving little chlorine to protect swimmers. Proper chlorine levels cannot be re-established without first eliminating the contaminants. External factors such as sunlight and heat also contribute to chlorine loss.
