So i recently started using a blank e-liq cartomizer or otherwise known as an ego-w F1clearomizer. When using a fresh one the vapor is thick and stastes great. But after 3-4 refills which is the equivelent to about a little less than a week the juice thats left on the bottom is nasty. Its dark i guess from burning and turns the juice that is refilled into the cartomizer dark. I was under the impression that these cartomizers/ clearomizer would last a while. At 6-12 bucks a pop, replaceing them weekly will be costly. Of course not more than traditional cigarettes but nit the point. Does anyone have experience with this product and any feedback with a viable solution or maybe an alternativr cartomizer. Any and all suggestions and responses are greatly appreciated.. Im not sure what to do, i even tried sucking out the little bit of nasty juice left on bottom so when i refill it wouldnt mix in with the fresh juice. Didnt really help 