Ok so tap TDS is 200, after R.O is 30, so we know the R.O is working, albeit poorly...
Heres an idea, get an empty pop bottle, screw the lid on.... drill a hole in the lid and the base. Make one hole just big enough to force you tubing coming from the R.O into.
Fill the bottle to the brim with your resin, turn the R.O on
then out the other hole of the pop bottle should come pure water, if it doesnt alter the R.O tds then resin must be shot.
If it does the D.I is faulty somewhere
if you have some fresh resin try that either in the pop bottle or the vessel before concluding the vessel is at fault
process of elimination old lad
