My tub laid dormant for 4 years and I just fired it up last week and Im having a brain fade in regards to a chemical problem, I put in the reserve packets (I use a bromine system) and I have the floater going opened up more than in the past. its been over a week and I just tested the bromine level and it shows almost 0. I have an ozinator, how do I know if it is working, how can I check it, also i use bromine tablets and they are 4 years old do they go bad, they appear to be in good shape and smell like they always did. Any help would be appreciated.