Originally Posted by
Calluna4u
Easiest and cheapest for small quantities. Get a 200litre metal drum. Half fill it with water, put burners underneath and bring to the oil. Shove all your wax into a cloth bag, including a brick or heavy stone. Place it in the drum (can be easier to do this BEFORE you heat the water) and allow it to boil for a couple of hours. Turn off the heat and leave it overnight. In the morning you should have a nice cake of pure wax on top and a bag of slum. Tip it all out and repeat again with another load if you have it to do.
If the bag is too big and ends up fouling the wax later (not fouling as in contaminating, fouling as in contacting and getting tangle with) you can just stick a couple of heavy things on top to hold the top of the bag down.