RDA vaping requires the vaper to manually add e-liquid directly onto the coil and wick, rather than feeding it through the tank as would be done in standard commercial devices.
RDAs have a well at the bottom of the build deck that holds the e-liquid, and the wick tails are placed into the well to soak up the fluid. You can find the top and appropriate RDA tanks at https://www.vapehousehi.com/category/tanks/rda-tanks/
Because the wells don’t hold as much as standard tanks, you’ll need to refill them more often to prevent the wicks from drying and burning.
Because of their manual nature and the need for increased amounts of refills, RDAs are less convenient than most tanks unless they’re used with a squonk mod, which allows for e-liquid to be fed through a small window in the mod.
RTA Vaping technically includes any kind of rebuildable tank but has stuck with a particular build system as new ones are created. RTAs have a deck that sits either under or in the middle of the tank, with a chimney and bell system extending up to the drip tip.
These chimney and bell systems are key features of the RTA build that make it stand out from the others. The bell surrounds and encloses the deck and is sealed off from the juice, creating a vacuum within the tank that feeds the wick.
This leads to a much more efficient wicking system and is especially good for higher power vaping, while the chimney creates a concentrated vapor stream, increasing vape flavor.