You question is not clear, Can you clarify and give more information
Carbon block will handle chlorine. Reverse osmosis will remove some but not all of the floride and chromium. I believe there are multiple filter systems capable of 100%, but I'm not familiar with them. Chromium 6 is currently being removed by expensive systems provided by PG&E, here in Hinkley Ca. on several properties. The maintenence on these systems makes them costly even after the initial purchase. You can get more info on this at their remediation website, or google it.