So, here is how you could recharge an empty refill glass container yourself. This is just an example of how it is done for one brand, but I imagine the others are similar.
***Caution – Even tough the warmer uses a small amount of heat to release the fragrance by warming the oil up, it is still a good idea to test the oil first and keep on eye on the new refill before letting the unit run by itself.***
Okay now, if you still want to proceed, here is what you will need:
1) An empty refill
2) Scented oil for oil warmer
3) A knife or something thin and stiff