From experience of a project ...

From experience of a project where this was tried it won't do any good for improving the problems that you describe. You would be far better advised to address the issues causing this which are likely to be inadequate air scour or backwashing, possibly poor distribution of air and backwash. I wouldn't go much on their claims of removing specific substances either. Converting to a combined air scour and backwash would be more likely to work.