How much of the AromaSaules "FIR" infusion should I use for a typical sauna session?

Start by adding a small amount to a bowl of water in your sauna or steam room. A common starting point for a 400 ml bottle is to use 10–15 ml (roughly 2–3 capfuls, assuming a standard cap) diluted in 1–2 litres of water. Pour this mixture onto hot stones to release the fir scent with the steam. The intensity of the aroma depends on the room size, ventilation, and personal sensitivity. If you're new to the product or sensitive to fragrances, begin with half that amount. You can always add more during your session if you prefer a stronger scent. In a bathtub, a similar small amount (5–10 ml) mixed directly into the warm water is usually sufficient to create a noticeable forest-like atmosphere. Always dilute the infusion in water before use; never apply it directly onto hot surfaces without dilution, as concentrated essential oil compounds may produce overly strong fumes or residue.