I am running a FOWLR setup with all of the usual bells & whistles. I also bought an RO/DI unit which yields water at 9 or 10 ppm. I get readings directly from the tap at 470ppm so I know I am improving my water tremendously. So do you think that 10ppm is acceptable? Or should I consider adding to the unit to bring it to 0 ?


Thanks,

Mark