Okay, I spoke to our local pool professionals today (they are also the installers of my pool) and they say it can be done as long as you weren't using a bromine feeder. In my case the bromine tabs were dissolved in an Aqua Genie dispenser. This dispenser must be thoroughly cleaned of all traces of bromine before being used for chlorine. The problem is that I won't get a chlorine reading for a long time, perhaps months, until all of the bromide is used up. The pool will be sanitized but I will have to rely on the appearance of the water to determine if I am feeding enough chlorine into the system. He says this is not too difficult and eventually I will begin to see chlorine readings as the residual bromide is used up. Anyone had any experience with this?