I have a 30,000 gal bromine pool with a Hayward chemical feeder full of bromine pellets running at max opening. I have been shocking the pool with chlorine shock once a week or every ten days. Overall the pool looks great. ph is 7.6, total alkalinity 120. I have some residual cya from having used sodium dichloro (around 40ppm). Calc hardness is 280. But for two seasons now, except for brief periods after shocking, I have no detectable bromine in the pool. My thought is that the bromine has been burned off, the brominator isn't enough to provide a bromine base and perhaps I should add sodium bromide. What do you think? Also what kind of shock should I be using/. Thanks