It is a 27' above ground pool. I have been shocking the pool with chlorine and using Bromine tablets. Apparently I have gotten some very bad advice with regards to using Bromine in an outdoor pool. Last summer I was noticing that I was having a very hard time to keep the pool sanitizing levels constant. Good one day next day nothing. Does the Bromine disappear in sunlight or just go dormant waiting for another dose of chlorine?