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...some sodium bromide may help, or better yet some bromine concentrate.
A few questions: Â Are your pH, Alkalinity, and hardness where they are supposed to be? Â What is in your shock and how much are you using? Â What is the setting on the feeder? Â Are the pucks eroding in the feeder? Â (They should over time.) Â If not, as Steve suggested, make sure the feeder isn't plugged. Â (Water needs to be able to wash through and pick up bromine.)The other possibility is an infection in the tub. Â The fact that your levels drop quickly makes me think that the bromine is getting used up trying to fight off an invader. Â Super-sanitizing (I prefer dichlor, but the the suggestions re: sodium bromide/bromine concentrate make sense, too -- see FLTUB's similar thread) until you are able to maintain a good residual is the next thing to do after checking the feeder.Good luck! Â
Even though my bromine ppm is seemingly always low... the weekly shock, ozone etc. keeps the water clear.