While there are some measures to reduce the need for sanitation chemicals to almost nothing, some amount of sanitizing agent (e.g. chlorine) is necessary. A sanitizing agent plays an important role in every certified hot tub sanitation system. Even saltwater pools use electrical currents to turn the salt into chlorine. Many of the sanitation products that claim to eliminate chlorine expose you to other chemicals that are equally hazardous (if not more) and that are less effective. The ozone, ion, and AOP systems we offer reduce the amount of chlorine needed to the lowest levels possible with current technology. Good usage habits such as showering before soaking also reduce the need for chemicals. The recommended doses are detailed in our Water Sanitation Guidelines. For reference, our recommended chlorine dose for one of our bestselling models (6′ Round with ionizer) is merely one tablespoon at a time during break-in, dropping to ¼ tablespoon after the tannins have been released from the wood. These levels are so low that if you hadn’t put it in yourself, you’d never know it was there. You will not notice a persistent odor or feel any effects when using the tub.