In hot tub water, it is very important to ensure you have a proper sanitizer level. Low bromine/chlorine levels in a hot tub mean that the bromine/chlorine levels are not in the recommended range that is effective to kill bacteria. Bromine/chlorine is needed in hot tubs to make sure bacteria are kept at bay. Got too much chlorine or bromine in your hot tub? Either one can irritate your skin and damage your spa. Here’s how to lower them quickly and. However, it can be less irritating to the body than chlorine. Bromine also has the added advantage of increased stability in higher temperatures and wider pH ranges than chlorine. As a result, as conditions in your hot tub fluctuate, bromine will last longer as an effective sanitizer. I have a new Sundance Chelsea spa that was filled last week. A week later now, 2 test strips are showing very low (almost 0) bromine. I had my water tested at the spa store yesterday and they confirmed that the bromine level was low and told us to add more bromine tablets too. Learn how to understand spa and hot tub water chemistry, sanitation, pH, shock treatments, Proper reading for chlorine is 1.5 – 3.0 PPM and 3.0 – 5.0 PPM for bromine. Because pH-lowering chemicals will lower the total alkalinity as well. How to Set up and Maintain Spa Water Bromine. It can be very easy to set up. If it is too low, like with soft water, it will corrode your equipment. An ideal level is.