- To eliminate some of the drawbacks of water distillation, some modifications were made to the distillation units.
- A perforated grid was introduced in the still, to support the plant material and to avoid its direct contact with the hot furnace bottom.
- When the water level is kept below the grid, the essential oil is distilled by the rising steam from the boiling water. This mode of distillation is generally termed water and steam distillation.
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