The system should not be used in water containing high amounts of chloride (seawater, brackish water) because side products as chlorine respectively hypochlorite will be formed. Those side products also act as disinfectants but need much more time to degrade. Prolonged electrolysis in stagnant water can cause the formation of chlorate. However, because of the high current density causing a limitation of substance transport towards the active electrode surface the generation of chlorine in drinking water is negligible.
It is a fact that ozone oxidizes bromide to bromate. Bromates are cancerogenic. Therefore this chemical reaction is undesirable. The drinking water ordinance contains limits for those substances. Bromate fomation can be decreased by lowering the pH value of the water.