This Air Still is the easiest to use Water Purifier / Essential oil extractor on the market. All you need to do is fill it with your essential oil liquid to the 1 gallon mark on the inside of the unit and turn it on! No water supply is required with the use of this Air Still. There is a fan that runs continuously to cool the condenser coils. This unit is fully enclosed and has a safety reset button to shut it off if you were to leave it on too long. This is a Pot Style Condensor that is capable of 60% alcohol content if you are using it for biofuel manufacture. If you are distilling water we suggest using one of the carbon filters sold on this page.