Nitrate comeing from the R/O system, when I tested just plain tap water the nitrates was will above 50, it has been about 6 months since we had changed the filters, and we have very bad water to begin with. The water company which is a private company says they are within the federal guidlines, but when I test the TDC's they are well above 1800ppm then when I test the R/O water they are down to around 87-98ppm. That is why I was wondering if a DI
added to the R/O system would make a big difference at all. Sorry for the long rply but thought just incase you might have thought about something that I just covered.