I recently got a 280 gallon hot tub and am using bromine. I got a chemical set which had bromine tablets in it with a floater. I got the tub installed last week and even with four tablets in the floater, all the way open, I cannot get the bromine level over 1 ppm. The test strips work - I confirmed by rubbing one on one of the wet tablets. I've used sodium bromide and shocked the tub first.
What should I do?!