The 3rd stage Di canister on my unit always seems to be empty even tho I still get water out of my discharge (blue) line.Anyone else experience this. I can't see why or how water comes out the top discharge side if the canister is empty??? I used to think it was because I had the unit above my bucket to hold the R/O water and the water was draining out after I shut it off but I have since move it to below the bucket with the same results. The DI canister looks empty.???