Ok, so i have an Ego-C and I started out with the vision Clearomizers. I have been buying them from a store that is close to where I live. These were going bad (burning taste) in under a week, even though the people at the store told me they would last 2 weeks. So I decided to switch to a DCT system, at the store they are selling smoketech cartomizers to go with these the first one I had in there I messed up the first day because I overfilled the tank and got it into the cartomizer, it immediately turned black and I had to put in a new one. The second one lasted me about 4 days before it turned black. The third one I was using today, I had it on there for 3 days, the cartomizer was still completely white but I noticed that it looked really dry and thought maybe that's why it was turning black so fast so I put a few drops in the top and took a few puffs. Low and behold it instantly turned black again! I don't understand why this is happening, does anyone have any advice? I am also wondering what everyone else uses and how long they last them. A big reason for me to switch was to save money but I don't really feel like I am with how fast I am going through these cartomizers.