Sauna aroma for sauna rouryu. When you pour aroma water on a hot sauna stone, the aroma scent envelops the room along with water vapor. A refreshing and light scent. It is also recommended to blend it with other citrus scents. How to use: Dilute before use. A good rule of thumb is about 5 liters of water for 1~2 caps. Do not apply it directly to your skin or massage it with oil. You can also use the bamboo bowl as a mini room diffuser. Strictly prohibited: Do not put undiluted solution in the sauna stove as it is, as it may cause a fire.