More drops for a bigger room? Yes - lean towards 6 drops (or a touch more) for a large or airy room, and 3 drops for a small bedroom or bathroom.
Can I add it neat, without water? No. The SOSA Hotel Collection is water-based and made for the tank. Run a SOSA ultrasonic diffuser with water plus a few drops, never neat oil.
Dosing by room and mood
The right number of drops depends on three things: the size of the room, how much airflow it has, and how strong you like your scent. A small, closed bedroom holds fragrance well, so 3 drops is plenty. A large living room with a ceiling fan running, or a room that opens onto a balcony, loses scent to the air faster - so reach for 5 or 6 drops, and you can nudge a little higher if you want a fuller room.
My honest advice is to under-dose first. Add 3 drops, run the diffuser for five minutes, and walk out and back in. Your nose adjusts to a scent you sit in (this is called olfactory fatigue), so the test is always how the room hits you on re-entry, not how it smells while you stand over the tank. If it is too soft, add one drop and repeat. You will find your number within two or three sessions, and it tends to stay the same for that room.
Mood matters too. For sleep or a spa-clean bathroom, keep it light - a clean white-tea scent at 3 drops is a whisper, not a statement. For entertaining, when you want guests to notice the moment they walk in, a warmer amber or citrus-pepper style at 6 drops carries that hotel-lobby first impression. The fragrance does the work; you are just setting the volume.
Why water-based dosing is different
The SOSA Hotel Collection is a water-based ultrasonic diffuser fragrance, which is a different animal from the thick essential or carrier oils people sometimes try to pour into a diffuser. An ultrasonic diffuser works by vibrating a small plate thousands of times a second to break water into a fine, cool mist; the fragrance rides out on that mist. Because our fragrance is made to disperse cleanly in water, a few drops spread evenly through the whole tank and mist out steadily, rather than pooling or sitting greasy on the surface.
This is also why dosing is by drops, not by filling the tank with fragrance. You are scenting water, not burning oil. Three to six drops in a tank of water is the correct ratio; more than that does not make the mist last longer, it just makes the air heavy and uses up your bottle faster. Always use SOSA diffuser fragrance - raw essential oils and carrier oils are too thick to mist properly and can clog the misting plate over time, which is the single most common reason a diffuser stops working well. The fragrance is IFRA-standard and phthalate-free, composed in our Pune lab by an ISIPCA-trained perfumer, and made specifically to run through SOSA ultrasonic diffusers such as Boondh, Sukoon and Phuhaar.
One last note for value: because the dose is so small, a little goes a long way. The 15ml bottle at ₹299 gives you many full tanks while you find your favourite scent; once you know it, the 100ml at ₹999 or 300ml at ₹1799 will last months of daily diffusing at the best price per ml.
The SOSA range
The SOSA Hotel Collection is a water-based ultrasonic diffuser fragrance (a refill for your SOSA diffuser) in seven scents, each our own interpretation of the signature style a famous hotel is known for. A few drops in the water tank and the room carries that hushed, expensive calm. Prices below are the 15ml; it also comes in 100ml and 300ml.
| Hotel-inspired scent | Character | Best for | From |
|---|---|---|---|
| Quiet Luxury (Ritz-Carlton-inspired) | White tea + bergamot + cedar | Lobby calm; living room | ₹299 |
| White Tea Serenity (Westin-inspired) | White tea + aloe + cedar | Spa-clean; bedroom | ₹299 |
| Forest Suite (1 Hotels-inspired) | Cedarwood + vetiver + green leaves | Biophilic; study | ₹299 |
| Old-World Glamour (St. Regis-inspired) | Amber + violet + woods | Evening elegance | ₹299 |
| Tea Garden (Shangri-La-inspired) | Jasmine + green tea + white tea | Serene; quiet rooms | ₹299 |
| Warm Welcome (Four Seasons-inspired) | Citrus + floral + sandalwood | Gracious; reception | ₹299 |
| Lobby Bar (W Hotels-inspired) | Citrus + pepper + amber | Bold; entertaining | ₹299 |
Versailles
I trained as a perfumer at ISIPCA in Versailles, and the one thing every great hotel taught me is that scent is the first thing you notice and the last thing you forget. I wanted to bottle that feeling for the home.
So the Hotel Collection is seven water-based diffuser fragrances, each my own interpretation of the style a famous hotel is known for - composed in our own lab, made to run cleanly through a SOSA ultrasonic diffuser. Please use the SOSA diffuser fragrance only; raw essential or carrier oils are thick and can clog the misting plate.
To be clear and honest: these are inspired interpretations, not the hotels' actual proprietary scents. SOSA is not affiliated with or endorsed by the hotels named - the names just describe the scent style. I would rather you knew exactly what you are buying: a perfumer's take on that hushed, expensive calm, at an honest price.
Frequently asked questions
Facts verified June 2026: SOSA Hotel Collection is a water-based ultrasonic diffuser fragrance (refill) in 7 hotel-inspired scents - 15ml ₹299, 100ml ₹999, 300ml ₹1799 - composed in India by an ISIPCA Versailles-trained perfumer to fragrance-industry (IFRA) standards, phthalate-free, made to run through SOSA ultrasonic diffusers (Boondh, Sukoon, Phuhaar) and NOT for reed diffusers, waterless nebulisers, skin or wax burners; use SOSA diffuser fragrance only (raw essential/carrier oils can clog the misting plate). These are independent, hotel-inspired fragrance interpretations created by SOSA. SOSA is not affiliated with, endorsed by or associated with the hotels named; all hotel names are trademarks of their respective owners and are used only to describe the scent style.