Originally Posted by
Mr. Green
Just remember that waste from an RO/DI unit is just that, waste. It is concentrated metals, ions, and such that are rejected by the membrane. The increased waste you put back into the RO/DI unit could foul the membrane really quick, but it does depend on your incoming water quality. You might want to try draining it in a washer when you need to do a load of laundry, might save some water.
soory to disagree but waist water is just rejected water its the same water that enters the unit just cant pass the through the tfc fast enough with out hurting the tfc. its the same stuff that enters the unit your just using its presure then throwing it away