For the people that think their cartoz are still good after more than a day or two have never yanked out the carto's stuffing and looked at what they are inhaling. Try going through 10ml of any juice you choose, doesn't matter how clear or pure because after you look at how burnt the wrapper around the coil is, you will realize that why cartos were meant to be disposable.
I used to think that I could use the same carto until it died, which could be over 3 weeks or even longer. Then I noticed that my throat would start getting irritated before even going through 10ml of juice. Started blowing out the carto in an attempt to flush it out, even tried washing them but all that did was clean out the filler. The problem lies within the wrapper that goes around the coil, not the filler itself. That black burnt crap you see when you yank a carto apart cannot possibly be good for you to inhale and there is nothing you can do to prevent this. My Precious-LV2 is variable voltage and I have tried lowering the voltage down to 3 volts, the carto's coil wrapper still burns and is all black. Keep in mind that I use a liquinator and always keep my carto overly saturated.
I urge people to try going through 10ml then ripping apart that carto and see for yourselves. Carto brands won't matter either, I have Boges, Bauways and Smoktechs in all ohm ranges and the end result is the same. I toss cartoz daily and sometimes twice a day. Came to the conclusion that cartos are so cheap that changing them once a day is better than being a cheapskate with a sore throat.
Aloha, Keith