Turns out, I got a bad pack of carts that were missing the filler! I opened a new pack of carts last night, that I got from a different supplier and SURPRISE! filler in the cartridges. At first I felt like a dummy, but then I realized that the chinese website I ordered the last batch of carts from must have screwed something up. The new cartridges I got came in different packaging also, so I am going to keep ordering from the new guy I found. Thank goodness, now I can order some juice!