Inline cartridge in my opinion are useless. They only filter particles, not chemicals, iron, hardness, manganese or sulphur. The things that naturally occur in well water. I would remove the cartridge and forget about it. Then if you find that there is something you don't like about the water, such as hardness, or iron staining, have the water tested to see how much of the nuisance there is and deal with it with a "REAL" filter. I would also have the PH tested.