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Chlorine is used extensively in a variety of industries. For example, it is utilized as a bleaching agent in paper and textile manufacturing and as a component in the production of dyes, insecticides, cleaning solvents, and medicines. Its largest use is in the manufacture of plastics. Chlorine is also the most widely used disinfectant in the world and it is often used to disinfect swimming pools. Sodium and calcium hypochlorites are also used to chlorinate swimming pools, but this document deals only with elemental chlorine.

This pamphlet is intended to provide basic information on chlorine safety for swimming pool personnel. Throughout this text, the reader may be referred to other Chlorine Institute (CI) publications for technical topics requiring detailed explanations or for subjects of specific interest.

THIS PAMPHLET IS NOT INTENDED TO SERVE AS A COMPLETE GUIDE FOR PERSONNEL WHEN USING CHLORINE GAS AS A DISINFECTANT AT SWIMMING POOLS. EMPLOYEE TRAINING BEYOND THE SCOPE OF THIS PAMPHLET IS ABSOLUTELY ESSENTIAL FOR ANY PERSON USING CHLORINE GAS AS A SWIMMING POOL DISINFECTANT. SUCH TRAINING MUST BE ADMINISTERED BY COMPETENT PERSONS WITH SUFFICIENT KNOWLEDGE AND EXPERIENCE IN THE USE OF CHLORINE GAS AS A DISINFECTANT AT SWIMMING POOLS.