I have a new 6 stage RO/DI unit I just hooked up. When I turned it on the water filled the first 3 chambers then the middle (4th) and then started to come out of the unit, out of the black tube (waist tube). It then stopped, I opened the valve and it started to drain again. It is filled up my bucket with water. I just wanted to make sure its normal for it to drain out of the black waist tube all the time when its on. Its drains a lot faster then the fill tube.
I hope i dont confuse you.
Thanks,
Josh