Tanks are so much more than what they used to be. E-liquid needs to be put into something so we can vape. Tanks, are also called Clearomizers because they are typically a clear looking tank with an atomizer inside. The atomizer is the core of the device that converts e-juice into vapor. There are usually two main types of atomizers, top-coil atomizer where vapour is produced mid- or towards top of the tank, and bottom-coil atomizer where the vapour is produced at the bottom of the tank. Larger tanks last longer per refill. New equipment for electronic cigarettes is arriving daily, tanks are slowly being replaced by pods.