Ozone vs. Chlorine

Ozone does not completely replace chlorine, but it does reduce chlorine needs by 60-90% in a majority of pool and spa applications. The most effective sanitizer routine you can enact is through the use of a Corona Discharge ozonator as your primary sanitizer coupled with small amounts of chlorine. This ensures there is a residual sanitizer in the pool at all times. The dream of a fully non-chlorine pool is attractive, but no chlorine-free pool sanitizer system is reliable against all possible contaminants. Further, a small amount of chlorine will not create the red eye, itch, or swimmer's asthma that a fully chlorine-based system will. Using an ozone system provides the first line of defense against dangerous contaminants, and chlorine will still be in place as a safety net. 
Why Doesn’t the Pool Tech Talk About Ozone?
Chlorine is the traditional way of sanitizing pools in the U.S. Ozone, on the other hand, has been used widely in Europe, especially in commercial or public pools, for many years. Most pool technicians were trained to use chemicals for pool water maintenance and they tend to rely on what they know. Heavy chemical use under the continuous control of an expert can eliminate most dangers, and pool techs want this security. But now ozone systems are available that are safe, reliable, and effective. There is no reason to use the complicated chlorine-based sanitizer routines that are prone to getting out of balance.
Keep in mind that chlorine has the following significant drawbacks as a stand-alone pool sanitizer.
• Chlorine is hard to maintain at the proper level, whereas ozone is injected automatically with a proper installation.
• Many recreational water illnesses, like red eye and swimmers itch, are actually caused by the by-products of chlorine, which are called chloramines. Ozone destroys these by-products to eliminate concern.
• Over time, chlorine is expensive. DEL’s swimming pool sanitizers will save hundreds of dollars per year in chemical costs for pool users.
• Chlorine reacts with other organics in pool water – like sweat, urine, and other human fluids – and creates dangerous chemicals like nitrogen trichloride and aldehydes. Ozone helps avoid this by replacing a majority of the chlorine, and also by oxidizing the organics so the remaining chlorine can do its job much more safely.
Other Options
Ozone vs. UV
Ozone vs. Biguanides
Ozone vs. Ionizers

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