The past few months has been my first experience of having a hot tub. Testing and mixing the chemicals while trying to keep the water clear was a real pain. My two options were to hire a company to come by weekly and pay a continuing fee, or try the ozone treatment. Being a contractor of water treatment plants for the past 35 years, I've had experience with commercial ozone units being installed in San Francisco Bay Area water treatment plants. This unit installed simply and has solved all my problems regarding the water treatment of the new hot tub. My wife's hairdresser has already noticed improvement in her hair from no chemicals in the hot tub. Very satisfied with this unit and how simple it was to install.