So right when everything was great and I had mastered my pool chemistry... I got a hot tub! And now I'm reading and am more confused than ever. I went to the store to get bromine, the person explained I could get either tabs but then I had to buy a second product to activate, or I could just buy granulated product and all I had to do is add that, but I'd probably need to do it more often. I got the granulated product, but now I'm here reading about bromine banks, how you actually would just add bleach, and I'm confused even after reading the sticky thread. What I got says active ingredients are Available Chlorine (present as sodium dichloro-s-triazinetrione) 52.7% and Sodium-bromide 14.6%. Do I need anything else? If not, given I need to keep the hot tub around 4-6ppm bromine levels, how do I calculate how much to put in after testing. I did seem to understand I can test using the Taylor kit and multiply the free chlorine result by 2.25, so am good there, but still don't know what that means as far as what or how much I should add after each test.