Pink algae is actually a bacterial biofilm. Chlorine will do the trick! You need to post a complete set of test results for free chlorine, total chlorine, pH, total alkalinity, calcium hardness and CYA (stabilizer, cyanuric acid) done with a drop based kit and NOT test strips. Also the finish of your pool (plaster, vinyl, fiberglass) and the gallons. Then we will have a better idea of what is going on in your pool and the best way to treat it. Sodium Bromide will work on it by coverting your pool to a bromine pool for a while but it is not necessary and is one of those cases where the cure is as bad as the disease!
Post the numbers and we will get you on your way to a pool minus pink!