I was going to replace the DI last night, but after I installed the new DI resin I was getting 5ppm when I tested the water. I let it run for about a half hour and it still was showing 5ppm from the output. The only difference this time is I used an already packed container instead of packing it with DI resin manually like last time. I tried a few times of removing and replacing thinking it wasn't seated properly but that didn't help. I installed the old one back and it was back to 0ppm on the output. The old DI is almost exhausted there is not much of the original color left so I will need to replace it soon. Anybody else experience this and if so what did you do?