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. The scent of a traditional Finnish smoke sauna rises. Woody and smoky. Guests can enjoy the special Finnish sauna air. How to use: Be sure to dilute before use. A good rule of thumb is about 5 liters of water for 0.5-1 cup of cap. 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.