Chlorine Free
Swimming pool owners need to be aware if a chemical added to the water contains chlorine or is chlorine free, as this will affect the sanitizing capabilities of the water and potentially alter the water balance. Products will not always specifically list chlorine as an ingredient, as products like calcium hypochlorite (chlorine-based shock) actually contain high concentrations of chlorine. Swimming pools that are chlorine free should not have chlorine added to it, as this will upset the water balance and negatively affect other sanitizers and sanitation methods present in the pool.
Source:
- http://www.chlorinefreeproducts.org/
- Wikipedia, Chlorination.
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