Gas chlorine is chlorine in its purest form, and is the base element used in the production of all other swimming pool chlorine compounds, including tablets, powders, and liquids. It is used extensively in water treatment throughout the world due to its efficiency both as a sanitizing agent and as an oxidizer. Since gas chlorine does not contain any of the salts or additives found in all other chlorinating compounds, it does not promote the rapid buildup of these elements in the pool water. Although most large public and semi-public pools use gas chlorine via automatic feed systems, the use of gas chlorine in residential swimming pool water treatment is limited to a relatively small number of qualified pool service firms across the nation who are licensed, registered, and specially trained in its handling and use. Gas chlorine is an EPA-registered product, and its use has the approval of the National Spa and Pool Institute (NSPI). Gas chlorine has been used safely and reliably in residential pool water treatment for more than 50 years. No other chlorinating compound can compare to gas chlorine. It is the most efficient means of treating pool water. It significantly reduces the hardening of water, due to its purity. But, as its use is limited to a handful of extremely specialized pool firms, gas chlorine has the distinction of being perhaps the least understood chemical in the swimming pool industry. This lack of understanding has allowed a proliferation of inaccurate and misleading statements to be disseminated regarding gas chlorine from within the swimming pool industry itself. The National Association of Gas Chlorinators (NAGC) offers this treatise in an effort to address these statements and dispel the myths associated with the process of gas chlorination.
The following are typical areas of misunderstanding about gas chlorine: