Here the plant material is supported on a perforated grid inside the still. The lower part of the still is filled with water to a level below the grid. The water is heated to generate steam. The steam, usually wet and at low pressure, rises through the charge carrying the essential oil. The advantage of this method over water distillation is that the raw material is not in contact with boiling water. The exhausted plant material can be handled easily as it does not form slurry with water.
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