Ok, I read the post but I'm not sure what part of that is the same as me. Since the water is bright green, how am I going to take a reading? Do you know what caused the reaction? Why would the idiot at the store tell me to buy sodium bromide if this was going to happen? Please tell me step by step what I should do, I'm at a loss. This is not my first experience with a pool. Nothing like this has ever happened to me. So, what caused it? What will fix it?