I would go in and get the crud tested for Iron and silt content, depending on the levels this will give you your answer.
The system that would probably work the best is a water softener with a prefilter (That filter size would be indicitive of your silt content). Iron, Manganese, Calcium and Magnesium will all be removed via the water softener while the silk content should be filtered by your prefilter.
Now if he's on well water that has a very high silt content you might require two prefilters, normally in Calgary pre-filters would be changed every 1-2 years but on well water that could be as high as every 4 months.
The water softener should take care of your iron but for his usable water (The 1% of house hold water used for drinking, cooking... ect) I might look into a RO/DI, as a softener replaces your hardness Ions with Sodium or Potassium this means your kitchen sink tap is usually by-passed leaving you to drink unfiltered well water. The RO/DI can filter out your contaminants but I would look for a system that utilizes a counter current flush to extend the life of your membrane (As the strait silt content will damage the resin membrane fairly fast). The system should also come with a pre and post filter to reduce the stress on your membrane and remove any taste/ odor out of the final treated product.
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