- Location
- Palatine IL
One month after repalcing my RO/DI cartridges my TDS rdg changed from zero to 130ppm. The membranes on my system are about one year old & I use about 70-100 gallons per week. Is my water still Ok. At what rdg do I replace the membranes that are quite expensive. I did move the unit in between the zero & 130ppm rdgs; I am not sure if that has anything to do with the quality of water...
