I posted an issue with my smoketech DCT pyrex tank. We came to the conclusion it was the default cartos; they worked right away but performance was pretty horrible, the default cartos only have 1 hole. So using the same juice I switched to boge cartos with 2 holes. These don't suck up or produce any vapor. I pre filled the boge cartos (I did not pre fill the default ones). I left 1 sit in the tank overnight before trying it and the boge carto still would not work. I assume all carto's are horrible, if boge is the best?