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The most common factor is a slow down in useage. If the activity level in the spa has remained the same and the bromine still spikes it may be due to shocking the water. I belive thats what I think I just read in the previous post by Dr. Spa.Spahappy
Also you might want to remove the floater when you are using the spa.Jason,Store Manager for a D-1 & Caldera Dealer
This is a very important tip if your bromine continues to climb. The typical floating feeder will feed at a much greater rate in turbulant water, ie: jets running or people moving about.