Ok, here is the biggest thing with the so called Chem free systems,,,,,,,,, flow rate from the well.........
Take the WaterSoft Provector system, it needs at least 5gpm through the microniser to pull the air in and then 7gpm for the backwash..
So in short the well needs to be doing at a min 8gpm for every thing else to work correctly.. if that is not then the whole system might as well not even be in line.
Then the so called Chem free systems need a cleaning of the valve and pipes from where the air is pulled in to the filter every 1-2 years... build up in the lines starts to cut down on flow rate and that starts cut down on how good the system cleans its self and pressure in the house.
Systems like yours should not go into the area like what you have,, real pain to work on and change the media when needed..
Water soft iron filters use a mixed media and one of the medias is to correct the ph and needs to add some say once a year or every 2 years..
Calcite is what you would be looking for, measure the distance between the media and the valve, if it is more than 17" then you need to add calcite to bring the media up to the 17" differance..