I have installed 3 whole house water filters and am confused about this question.
The first filter is the cheap rust and big stuff 20 micron filter.
The second filter is the 5 micron charcoal taste and odor filter.
The 3 rd filter is the very expensive 1 micron filter, which I can't afford to buy, so I need your opinion.
Do I leave the 3rd filter empty or do I put two of the cheaper 5 micron filters in the 2nd and 3rd positions?
DK