I recently converted the sanitizer in my spa from bromine to chlorine. I was getting bromine readings but didn't feel the spa looked very sparkly and clear. Once I switched to chlorine, I realized there might be a problem. We cannot hold FC at all. I followed the "shocking" process outlined in pool school (which worked for our pool) but it is not working for the spa.
1. Is there a different process?
2. Does converting from bromine to chlorine have any bearing on our ability to hold FC?
3. I read somewhere about decontaminating the spa. Is this something I should try? If so, how?