i have no idea what sort of filtration system you're currently using but perhaps it already has several of the necessary stages and you could just add di resin stages onto it or use higher quality cartridges in your existing containers...
I was gonna suggest the same.
OP show is you set up you might be able to get away with less.
lots of customizable options out there as every ones needs are different its importent to get what you need not what "in"
contact your water depo for a water report ( they may have it online) that will tell you what in is your source water then go from there.


