A tank system having a rebuildable coil is an RTA. The user builds his own coil with a rebuild able deck. This build deck is at the base of the atomizer which is enclosed by a chimney system. After filling it up you can vape until the liquid is exhausted. Then you can fill it again. RTA’s are harder to build as these are assembled with multiple parts. Though RTA’s are convenient but they arrive with a small performance sacrifice. RTA’s are popular among the people who want to invest in some learning time. It’s a favorite choice of vapors due to its great flavor production.