To treat a hot tub or spa, you need two types of agents- an antimicrobial agent to kill bacteria and an oxidizer to get rid of contaminants and keep the water looking crystal clear. Although bromine is chlorine based, it works very differently than chlorine. Chlorine will kill the bacteria and then burn off leaving less chlorine behind. Bromine will kill the bacteria but then remains in the body of water. Something will then need to burn off the bromine that has reacted with contaminants, which is usually a chlorine based shock. This is how the water will get its clarity back when using bromine. When using iONRx, we eliminate that whole component of using bromine. By maintaining a very low level of chlorine, similar to drinking water, combined with iONRx, you will have the best of both worlds. A crystal clear and SAFE spa that uses almost 90% less chlorine based products.