The Purezone is compatible with Ozone pools and spas.  

Ozone Pools, Ozone Spas or Ozonated Pools and Ozonated Spas use an Ozone generator to sanitize the pool water and reduce the amount of Chlorine.

Ozone kills bacteria, parasites, and viruses in swimming pool and spa. Ozone can chemically destroy contaminants in the water. Ozone sanitizes your pool or spa water through the circulation system using an Ozone generator.  Ozone also masks the smell of Chlorine in the pool water.

Note:  Ozone pools and spas typically maintain FC Free Chlorine at a very low level, much lower than non-Ozone pools and spas.  After you activate your Purezone device, please contact Purezone Support.  Support can adjust your FC Free Chlorine Target level lower so that you don't receive constant Low FC Free Chlorine alerts in the Purezone app.