That might have been my issue, but then again both cardo's will filled completely and started messing up. One of them was starting to work, then all od the sudden, after filling it up, it started tasting HORRIBLE. I looked into the filling and it was a nasty brown... and mind you I had been trying to get it to work only a day after I opened it. I ended up throwing those two away, I'm REALLY hoping I can get the last one to work.