The growing list of serious health issues associated with exposure to chlorinated water is now overwhelming. The danger comes from chemical by-products in chlorinated water known as trihalomethanes, or THMs. When swimming, your body absorbs the harmful THMs threefold, through the skin, inhaling and ingestion. The ES3 was developed to eliminate people’s exposure to the hazards of chlorine in pools, spas and water features. We encourage you to do your own research.