OK, I use those. Basically, any time I open up the tank to refill or change the flavor, I remove the coil head that's in there, put it in a dish of cheap vodka to soak for several hours, and put a clean coil head in the tank. I've been rotating around 10 coil heads through 6 tanks for about two months this way.it is a Kanger pro tank
When a coil finally dies, I'll put it in a bin for rebuilding later (there are many ECF posts and YouTube videos from which to learn rebuilding Kanger coil heads).