Are you saying that the OP's iron filter is not mechanical filtration? I'm not familiar with brand names, just concepts.
With the addition of chlorine in this case it is a mechanical filter but, Pyrolox or greensand etc. minerals are not meant to be used as a mechanical filter. That's because if on dirty water those minerals will load up with dirt preventing them from oxidizing the soluble iron, H2S and manganese they are used to 'filter' by oxidation. Only Birm is used for turbid/dirty water.
BTW, I have a basic understanding of how an iron filter uses a micronizer to aerate and oxidize the iron so that it can mecanically filter it. Now a system with micronizer should also have a tank with air volume control to properly vent off the air and other gasses. The OP should be be passing gas through the filters.
Use of a Micronizer means an air injection system, not an iron filter, and air injection must have a turbidity filter (and the off gas vent tank you mention, which is also required with an air pump system), and only Birm can be used with air injection, not Pyrolox, greensand or the other minerals used in soluble clear water ferrous iron filters.