Hi there, first post here. Just had a few questions about using bromine in my tub. Since I live in Canada and sodium bromide is banned here, I began putting pucks in a floater and using bromine granules (bromine plus dichlor) until a sufficient bromide bank was built up. I I’m about four weeks in and when I shock my tub I can get levels up to around 10+ ppm. I’ve noticed however that about two or three days later there is zero bromine showing on my test kit. I will get a total bromine reading while other tests show None. Our hot tub gets moderate used by two adults and two children. Is it normal to have to shock more frequently? Also curious why one test kit would show sufficient bromine while others show none. Thank you for your help!