The researchers studied how bromate forms in bottled water when ozone is used for purification. They found that the pH of the water plays a big role in bromate formation. Higher pH levels led to more bromate being produced. Even a small amount of ozone in the water could result in high levels of bromate. The researchers also discovered that the amount of ozone used directly affected both the ozone exposure and bromate concentration in the water. Overall, the study showed that pH, ozone dose, and exposure time are important factors in controlling bromate levels in bottled water.