Quote Originally Posted by dpantle
I've had the filterdirect unit for about ten months now, and it works fine. I also use the handheld meter. The only issue I have with this unit is that the DI is mounted horizontally, and the resin expires on the top half, not the bottom (color changing). The water kind of "channels" through the housing. I usually just "spoon" out the color changed resin, and refill the rest. This seems to get me the best results as far as getting all I can out of the resin.
Just rotate the cartridge occasionally.