The highest quality and purest butane you can get! Puretane butane is manufactured in the United States. U.S. butane manufacturing standards are higher than in both Europe and Asia. The premium butane is triple refined through fractional distillation and then filtered 9 times for maximum purity. Puretane is the ONLY Butane company in the world that manufactures its own cans and valves in the United States. This ensures the high quality product is not compromised by impurities found in oversea manufactured cans. It doesn’t matter how many times butane is filtered if it is then put into a can that has lubricant residue on its interior walls, purity is lost.Try the best and forget the rest!