The reed is a passive source. No plug, no noise, no app, no timer, nothing to switch off, nothing to maintain and nothing to go wrong. It sits in a corner, it works on the air around it, it declines gently across about 6 to 10 weeks, and then you replace it or refill it. It is the right architecture for a small closed room - a consultation room with a door that shuts, a loo, a corner of a reception.
The Vaayu is a controlled source. Waterless cold-air nebulising of undiluted oil, so no water, no humidity and no wet residue anywhere; approximately 1000 m3 of connected air; a Bluetooth app and a timer so it runs in your opening hours and not at three in the morning; a 400ml tank; freestanding, wall or HVAC mounting; DC 12V / 1A at 5W, mains powered, so it needs a live socket. It is the right architecture for a larger connected volume that you want to behave the same way every day without anybody remembering anything.
So the question is never which is better. It is which shape of problem you actually have, and this page walks the four differences that decide it: reach, control, the shape of the level over time, and what the machine physically puts into the room.
What can a machine do that a reed cannot? Three things. Reach a much larger connected body of air; hold a set level rather than declining across its life; and run only in your opening hours, because it has an app and a timer while a reed has no switch at all. If none of those three matter in your room, the machine is simply the more expensive way to scent it.
What can a reed do that a machine cannot? Work with no socket, no cable, no noise and no maintenance, in a room where you would rather nothing electrical existed. It is also the honest choice for a studio that is not ready to commit, because at ₹749 you can find out what your building does before you spend sixteen times that. The Vaayu at ₹11,999 is about sixteen times a ₹749 reed at purchase.
Measure them and it becomes obvious. Say the open reception, corridor and lounge come to 1,400 sq ft at 12 ft: 1,400 x 12 = 16,800 cu ft, and 16,800 divided by 35.3 is about 476 m3. That is one connected body of air, it is a lot of air, and it is exactly what the Vaayu is built for, since it is rated for approximately 1000 m3 of connected air and SOSA's own copy also states 2,000 to 3,000 sq ft scented evenly. Now the consultation room: 150 sq ft at 10 ft is 1,500 cu ft, about 42 m3, behind a closed door. Nothing pushes scent through that door, so the machine in the corridor is irrelevant to it. That room is a reed at ₹749, and it is a better reed room than almost anywhere else in the building, because it is small, it is closed, and it is the room that takes the lowest dose in the studio anyway.
Here are the four differences that decide every case like that. Reach. A passive source works honestly on the air immediately around it; a machine puts a controlled source into a much larger connected volume. Control. A reed has no switch, no dial, no app and no timer - you get whatever the room's temperature and air movement give you, and that is fine in a small room and useless in a big one. A Vaayu has a Bluetooth app and a timer, which is how you scent ten in the morning to eight at night on the days you are open and nothing at all on the day you are shut. The shape of the level. Within any one visit both are flat, and anyone who tells you a client notices a reed declining during an appointment is inventing a problem. Across a season they differ: a reed declines gently over about 6 to 10 weeks and cannot be adjusted, while a machine holds a set level until you change it. What goes into the room. The Vaayu is waterless cold-air nebulising, so no water, no humidity and no wet residue, which is the whole reason it belongs in a room with gear and wardrobe in it; the ultrasonics are water-based cool-mist machines that put moisture into the air; and a reed is an open bottle of liquid with rattan sticks in it, which is a knock-over consideration rather than a hazard claim, and which is why it goes on a stable surface away from where people put camera bags down.
None of that is a quality judgement. The reed is not losing on reach; it was never entered in that race. The machine is not losing on simplicity; it never claimed simplicity. Pick the architecture the room's shape asks for, and then pick a level far lower than you think, especially in the rooms where people sit for hours. And whichever you pick, remember that fragrance adds scent and does not remove odour - source, then ventilation, then cleaning, then fragrance, in that order, always. A portion of every SOSA order supports girl-child education through Nanhi Kali.
The clean test, if you want a single question rather than four: does anything about this room need to change on a schedule? If the honest answer is no - it is one small space, it is either occupied or it is not, and one steady level is all you will ever want - then a passive product is not a downgrade, it is the right tool, and the ₹749 you spend is the entire budget. If the answer is yes - it must be on at ten, off at eight, off entirely on Monday, and identical for a couple returning in July who last came in March - then you are buying control, and control is what the ₹11,999 machine sells.
One warning that catches people out. Do not choose the machine because you want a stronger studio and think a reed is "not strong enough". A reed underperforming a room is almost always a volume mismatch rather than a strength problem: somebody put one reed in a 1,000 sq ft open floor at 12 ft, which is 12,000 cu ft or about 340 m3, and then concluded the product was weak. It was not weak. It was a small passive source doing its honest job in a room far larger than the one it was designed for, and the fix is the right architecture rather than a bigger bottle of the wrong one.
Four architectural differences - and not one of them is quality
The reason this comparison gets written as a ladder is that the prices look like a ladder. ₹749, then ₹899, then ₹1,899, then ₹3,499, then ₹11,999 - it reads like a good, better, best chart, and it is not one. Two of those numbers are a passive product and three are powered machines, and among the powered ones two different systems are represented. Price is telling you about capability across different jobs, not about quality within one job.
What actually separates these products is architecture, by which I mean the physical arrangement by which fragrance gets from a bottle into the air a client is breathing. A reed diffuser does it by evaporation, at whatever rate the room's temperature and air movement dictate, from the surface of rattan sticks standing in oil. Nobody sets that rate; the room sets it, which is why a reed in an air-conditioned still room behaves differently from the same reed next to a door that opens forty times a day. A waterless nebulising machine does it by breaking undiluted oil into a cold-air stream, with no water and no heat involved, at a rate you set and a schedule you set. An ultrasonic does it by vibrating a tank of water with fragrance in it into a cool mist, which means it also puts moisture into the air, and that is a real difference in a studio rather than a technicality.
Once you see it as architecture rather than as quality, the decision stops being about taste and starts being about the building. And the building question is always the same one: how big is the connected body of air, what is the boundary of it, is there a plug, and does anything need to happen on a schedule. Everything below is those four questions, asked properly.
One more framing before the detail, because it is the thing studio owners tell me afterwards that they wish they had understood first. The most common outcome of doing this properly is not "buy the expensive one". It is "buy the machine for the route and a reed for the room behind the door", which costs ₹11,999 plus ₹749 rather than ₹11,999 plus a second machine, and which produces a better result than either alone. Two architectures, one register family held as closely as the two product ranges allow, and a floor plan that has been thought about rather than shopped at.
Work through the real range. A 150 sq ft consultation room at 10 ft is 1,500 cu ft, about 42 m3. A 200 sq ft reception at 10 ft is 2,000 cu ft, about 57 m3. A 500 sq ft reception-plus-lounge at 12 ft is 6,000 cu ft, about 170 m3. A 1,000 sq ft open floor at 12 ft is 12,000 cu ft, about 340 m3. A 1,400 sq ft floor at 12 ft is 16,800 cu ft, about 476 m3. A 1,500 sq ft floor at 14 ft is 21,000 cu ft, about 595 m3. A 2,000 sq ft floor at 14 ft is 28,000 cu ft, about 793 m3. And a double-height shooting bay at 20 ft over 1,000 sq ft is 20,000 cu ft, about 566 m3, which is a useful reminder that studios are rarely 10 ft and that assuming they are will make you under-buy by a factor of two.
A passive source is an honest small source. It works on the air around it and it makes no claim on 476 m3. Put a single reed in the middle of an open studio floor and what you have is a nicely scented corner and an unscented everything else, and the correct conclusion is not that the reed is weak but that the room was never a reed's room. The Vaayu is rated for approximately 1000 m3 of connected air precisely because that is the problem it was built for.
Now run it the other way, because this is where studios waste money. A 42 m3 consultation room behind a closed door is about four per cent of what a Vaayu is rated for. You can absolutely put a commercial machine in it, and it will work, and it will be a commercial machine set very low in a very small room while the ₹749 product designed for exactly that job sits unbought. Worse, a commercial machine in a tiny room is easy to run too high, because its settings were designed for a far larger volume, and a consultation room is the room in the building that takes the lowest dose of anything - it is a three-to-six-hour room, and a level you love at ten minutes is tiring at hour three.
Which is why the useful mental model is buckets rather than buildings. Walk the client route during an actual appointment and note every boundary: a door that shuts, a return grille, a pressure difference, a stairwell. Each boundary ends one bucket and begins another. You scent buckets. If you have one big bucket and two small ones, the honest kit list is one machine and two reeds, and it will cost less and work better than three machines or one machine and a lot of hoping.
Ventilation belongs in this factor too. A well-ventilated studio is genuinely harder to scent, whichever architecture you choose, and that is a good problem to have. You solve it with placement and level and by sizing to the connected volume, never by closing a vent or shutting off extraction so the fragrance hangs about longer, and I will not write that sentence in any phrasing.
The virtue is that nothing can go wrong and nobody has to do anything. There is no socket to find, no cable to route across a studio floor where people walk with tripods, no plug that a cleaner unplugs to run a vacuum and forgets to plug back in, no app to lose the password for, no setting for a well-meaning assistant to adjust on a slow afternoon. In a rented space where you cannot drill and do not control the electrics, that is not a minor convenience - it is often the deciding factor. And it is silent, which matters more in this vertical than in most: a studio that records audio does not want a device making noise anywhere near a set, and a passive product makes none.
The limitation is the other side of the same coin. A reed is scenting your studio at three in the morning on the day you are shut, and there is no way to ask it not to. It cannot be turned up for a busy Saturday or down for a quiet Tuesday. It cannot be told that you open at ten and take your first client at eleven.
The Vaayu is the opposite trade. It has a Bluetooth app and a timer, and that is the feature studio owners consistently underestimate before they buy and consistently name as the best part afterwards. It means the source runs in the hours a human being is in the building to experience it, which is the single biggest lever a studio owner has over anything to do with the consumable side of this, and it means the room is at the right level at eleven o'clock rather than at whatever level twenty-four hours of unattended running produced. The cost of that control is a live socket: DC 12V / 1A at 5W, mains powered, mounting freestanding, on a wall or into HVAC. Walk your floor plan looking at sockets before you decide, because a machine positioned where the plug happens to be rather than where the air needs the source is scenting the corridor while you wonder why the lounge smells of nothing.
The ultrasonics sit in between on control and are worth naming honestly here rather than being left out of the comparison. SOSA Boond at ₹899, SOSA Sukoon at ₹1,899 and SOSA Megh at ₹3,499 are powered, so they can be switched off and set, and they need a socket like anything else powered. They are water-based cool-mist machines running the water-based Hotel Collection from ₹299, which means they put moisture into the air as well as fragrance. In a humid coastal studio in August that is a real consideration, and it is also why you do not point one at anything you care about - ordinary studio prudence, not a protection or damage claim, and SOSA publishes none.
There is a staffing version of this factor as well. Ask who in your building would actually be responsible for the air. If the answer is a named person who is there every day and is good at small routines, a passive product is very manageable. If the answer is "nobody, everyone is holding a camera", then you are choosing between a product that needs nothing and a product that manages itself, and the two things you should not choose are the option that needs somebody and the assumption that somebody will be found.
Across a season they behave differently, and this is a genuine difference rather than a marketing one. A reed diffuser lasts about 6 to 10 weeks, which is SOSA's published figure and one of the very few duration numbers in this whole category that anybody publishes honestly. Across those weeks it declines gently, and it cannot be adjusted upwards to compensate, because there is nothing to adjust. A machine holds whatever level you set until you change it, and it holds it in week one and week nine identically.
Whether that matters depends entirely on the business you run, and the honest answer differs by studio type. A wedding studio brings the same couple back four or five times across three to six months - enquiry, consultation, shoot, album selection, collection - and those five encounters are what turns a fragrance into a house style. That business gets real value from a level that does not drift. A portrait studio where almost every client comes exactly once gets much less value from it, because nobody in the building is comparing March against July. A rented-by-the-hour space used by different photographers on different days will not achieve consistency by any means available, and should choose the architecture that needs the least management rather than the one with the most control.
Now the fourth difference, which is about what the equipment physically puts into the room, and which matters more in a photography studio than in most commercial spaces. The Vaayu is waterless cold-air nebulising of undiluted oil: no water, no humidity and no wet residue. That is the specific reason it is the machine that belongs in a room containing gear, wardrobe, backdrops and paper. The ultrasonics are water-based cool-mist machines and they do put moisture into the air, which is a normal thing for a diffuser to do and a thing to think about in a room where equipment lives and in a coastal city in monsoon. A reed puts nothing into the air mechanically at all; it is an open vessel of liquid with rattan sticks in it, and the only sensible precautions are the obvious physical ones - a stable surface, away from where camera bags get put down, away from the spot where lenses get changed, and out of a walkway. That is housekeeping and prudence. It is not a claim that any product protects, damages or is certified safe for photographic equipment, because SOSA does not publish one and this page will not invent one.
Two things are true of both architectures and are worth stating so that neither gets credit it has not earned. Neither removes odour: fragrance adds scent, and no reed and no machine at any price neutralises, absorbs, purifies or cleans anything. And neither is a substitute for airing a room, laundering the soft furnishings or taking the food waste out of the building. Source, then ventilation, then cleaning, then fragrance, and a studio that gets the first three right needs less of the fourth whichever way it buys.
- Decide what shape of problem the room is before you decide which fragrance you like.
- Measure connected volume: area times ceiling height, then divide by 35.3.
- Look for a live socket where the source should go, not where the plug already is.
- If the studio is shut half the week, the timer is the argument, not the coverage.
The registers are two different sets, and that is a real consequence
Now a consequence of this choice that almost nobody mentions until after the money has been spent, and which genuinely matters in a studio whose whole point is that a returning client meets the same air: the reeds and the machines run different fragrance sets. These are not the same seven registers in different packaging.
The water-based Hotel Collection is seven registers and it runs in the SOSA ultrasonics. Quiet Luxury is white tea, bergamot and cedar - hushed, polished lobby calm, and the default for a studio reception. White Tea Serenity is white tea, aloe and cedar - clean, weightless and spa-like, for a pale, daylight-heavy space. Forest Suite is cedarwood, vetiver and green leaves - grounding and biophilic green, for concrete, plants and dark timber. Tea Garden is jasmine, green tea and white tea - serene tea-and-jasmine calm, and the best floral for a bridal consultation because the jasmine sits inside the tea rather than on top of it. Warm Welcome is citrus, floral and sandalwood, gracious rather than cool. Old-World Glamour is amber, violet and woods, plush and evening-elegant, right in a dark portrait room and wrong in a six-hour album room. Lobby Bar is citrus, pepper and amber, bold and after-dark, with one home in this vertical and that is a studio hosting evening events. Each is SOSA's own hotel-inspired interpretation; SOSA is independent and is not affiliated with, endorsed by or connected to any hotel brand.
The Vaayu and the ducted machines do not take that bottle. They run four hotel-inspired waterless blends, supplied with the machine as one of three bundle choices, and the ₹299 water-based bottle never goes into a Vaayu or an HVAC machine. That is the single most expensive misunderstanding in this category and it is worth reading twice.
And the reeds are a third set again, with their own registers rather than Hotel Collection ones. Morning Freshness at ₹749 is Malabar lemon, mint and eucalyptus. Garden Bloom at ₹799 is British rose and night-blooming jasmine. Evening Calm at ₹799 is Kashmir lavender and chamomile. Mountain Breeze at ₹849 is Himalayan pine, sage and cedar, and it is the one that sits closest to a studio's woody register, which makes it the natural companion to a cedar-led machine elsewhere in the building. Fresh Brew at ₹849 is Coorg coffee and Kerala vanilla, which is a delight in a home and a risk in a room where somebody sits for four hours choosing between two nearly identical frames.
So if you run a machine on the client route and a reed in the consultation room, you cannot literally hold the identical register in both. What you can do is hold the same family, and in practice that means woody and green rather than floral and gourmand: a cedar-and-vetiver machine on the route with Mountain Breeze in the closed room reads as one building, while a cedar machine on the route and Fresh Brew behind the door reads as two buildings and a client feels the seam the moment the door opens. Choose the pairing deliberately rather than discovering it, and if getting them close matters to you, say so on WhatsApp before you buy rather than afterwards.
Whichever architecture and whichever set, the level rule does not change. Dwell time sets the dose. Reception is a thirty-second room and can carry a little presence. A consultation, bridal or album-selection room is a three-to-six-hour room and takes the lowest dose in the building; under-dose it and let consistency do the work. The makeup and styling area already has hairspray, setting spray and somebody's own perfume winning in it by mid-morning, so adding a register there makes a third smell rather than a blend, and the honest move is to leave it and treat it as a ventilation and cleaning job. The active shooting sets are usually not the opportunity at all - the crew is in them eight to ten hours and the client's attention is on being photographed. The equipment store gets nothing. And a newborn photography room should be fragrance-free without hedging, with maternity rooms unscented too, because pregnant clients are commonly scent-sensitive and nausea is ordinary in pregnancy - which is a plain reason for an unscented room and not a basis for any health, safety or calming claim in either direction. The client's own preference overrides everything on this page, and a bride is often wearing her own fragrance and sometimes trialling one for the wedding day, which your studio has no business competing with.
| Scent | Why it suits the mood |
|---|---|
| Reed diffuser · small closed room | From ₹749, about 6 to 10 weeks, no plug, no noise, nothing to switch off. The right architecture for a 150 sq ft consultation room at 10 ft - 1,500 cu ft, about 42 m3 - behind a door that stays shut, and for a loo or a quiet corner. It asks nothing of anybody, which in a building full of people holding cameras is a genuine specification rather than a consolation. |
| SOSA Vaayu · connected floor | ₹11,999. Waterless cold-air nebulising of undiluted oil, no water, no humidity, no wet residue. Approximately 1000 m3 of connected air, and SOSA's own copy also states 2,000 to 3,000 sq ft evenly. Bluetooth app and timer, 400ml tank, freestanding or wall and HVAC mount, DC 12V / 1A at 5W and mains powered. The answer for an open reception, corridor and lounge that must behave identically every day. |
| Ultrasonic · one room with a socket | The middle architecture, and honestly the right one more often than either extreme. Powered, so it can be set and switched off, but sized for a room rather than a floor. Boond ₹899, Sukoon ₹1,899, Megh ₹3,499 with its 6 litre tank for a lounge that runs all day, all running the water-based Hotel Collection from ₹299. These are cool-mist machines, so they put moisture into the air as well as fragrance. |
| Both together · the usual right answer | A machine on the connected client route and a reed in the room behind the closed door. It costs less than two machines, it works better than one machine hoping to reach through a doorway, and it respects the fact that the long-dwell room wants the lowest dose in the building anyway. Keep the two registers in the same family - woody with woody - so the building reads as one place. |
The practical buying sequence, then, in the order that wastes the least money. Do the free work first: air the rooms, find and fix any source, launder the soft furnishings, take food waste out of the building rather than into the studio bin, and run the extraction in the loo and the styling area. Fragrance adds scent and does not remove odour, so a studio that skips this step buys equipment to solve a housekeeping problem and is disappointed by both.
Then walk the plan and write down the buckets. For each one, note the connected volume in cubic metres, whether the door stays shut during an appointment, whether there is a live socket, and whether anything about that room needs to happen on a schedule. Rooms with no socket and no schedule are reed rooms. Rooms with a socket, a schedule and a large connected volume are machine rooms. Rooms with a socket and a modest volume are ultrasonic rooms. Rooms where people work rather than wait - the sets, the styling corner, the equipment store - get nothing, and you write that down too so that nobody helpfully adds a diffuser in eight months.
Then buy. Reeds from ₹749, with the 130ml from ₹1,249 and refills at ₹2,399 for 300ml and ₹3,499 for 500ml, lasting about 6 to 10 weeks. Ultrasonics at ₹899, ₹1,899 and ₹3,499, running the water-based Hotel Collection from ₹299 with 100ml refills at ₹999 and a pack of seven 15ml bottles at ₹1,799 for trying registers in your own air. The Vaayu at ₹11,999, CE, RoHS and SGS. And for a genuinely large ducted building, Aangan at ₹25,999 for approximately 8,000 to 10,000 sq ft or Meenar at ₹38,500 for approximately 12,000 to 18,000 sq ft.
If you are still weighing whether to buy a machine at all rather than which one, the prior question is answered at length in is a commercial scent machine worth buying for my photography studio, which is allowed to say no and frequently does. If your current system is a can kept behind the desk, read room spray versus commercial scenting for a premium studio, because the difference there is a mechanism difference rather than a budget one. And if what you want to know is how much liquid any of this actually gets through, how much fragrance a photography studio will use every month is honest about which parts of that are publishable and which are not.
On which: SOSA does not publish a consumption rate, a refill frequency, a monthly running cost or a machine lifespan for any of these machines, and this page will not estimate one in any form. The reed duration of about 6 to 10 weeks is published and is the one duration figure you will find here, and that is deliberate rather than an oversight. Everything else depends on how many hours a day the machine runs, the connected volume you are scenting, the setting you chose and how many volumes you decided to scent at all - all of which are facts about your studio rather than about the product. Bring your floor plan to WhatsApp at +91 96192 18531 and it becomes a conversation with real numbers in it. Bulk orders are welcome, custom label or logo on product is available, and a bespoke composition made only for your studio is a real SOSA service discussed there rather than priced on a page.
The SOSA scenting range
SOSA sells two different systems and one of the commonest mistakes is mixing them up. Size by the connected air volume of the room you are actually scenting - floor area multiplied by ceiling height gives cubic feet, and cubic feet divided by 35.3 gives cubic metres. A door that stays shut ends one volume and begins another.
| Machine | System | What it is for | Price |
|---|---|---|---|
| SOSA Boond | Ultrasonic · water-based | A small desk or corner unit for one enclosed room - runs the water-based Hotel Collection | ₹899 |
| SOSA Sukoon | Ultrasonic · water-based | A larger ultrasonic for a reception or consultation room - Hotel Collection from ₹299 | ₹1,899 |
| SOSA Megh | Ultrasonic · 6L tank | A large-tank ultrasonic for a bigger lounge that runs all day | ₹3,499 |
| SOSA Vaayu | Waterless cold-air nebulising | The commercial machine - approx 1000 m3 of connected air, Bluetooth app and timer, no water and no humidity | ₹11,999 |
| SOSA Aangan | HVAC nebulising | Ducted scenting for approximately 8,000 to 10,000 sq ft | ₹25,999 |
| SOSA Meenar | HVAC nebulising | Ducted scenting for approximately 12,000 to 18,000 sq ft | ₹38,500 |
Two systems, and they are not interchangeable. The ultrasonics - Boond, Sukoon and Megh - run the water-based Hotel Collection from ₹299. Vaayu and the HVAC machines run waterless nebulising oil; the ₹299 water-based bottle never goes into a Vaayu. SOSA blends are SOSA's own hotel-inspired interpretations and SOSA is independent and not affiliated with any hotel brand. A portion of every order supports girl-child education through Nanhi Kali.
- Vaayu ₹11,999 - waterless cold-air nebulising, approx 1000 m3 connected air, Bluetooth app and timer, 400ml tank, freestanding or wall / HVAC mount, DC 12V / 1A, 5W, mains powered, CE / RoHS / SGS.
- Aangan ₹25,999 for approximately 8,000 to 10,000 sq ft and Meenar ₹38,500 for approximately 12,000 to 18,000 sq ft - both ducted into HVAC.
- The ultrasonics - Boond ₹899, Sukoon ₹1,899, Megh ₹3,499 - run the water-based Hotel Collection from ₹299, with 100ml refills at ₹999.
- Not published, and therefore never stated on this page: consumption rate, refill frequency, monthly running cost, machine lifespan, installation lead time or any minimum order. Those go to WhatsApp +91 96192 18531.
Versailles
A photography studio sells a feeling before it sells a photograph. A couple sitting on your sofa choosing an album is doing something emotional, and they are doing it in your air for three or four hours. That is a long time to be in a room, and it is the reason I keep telling studio owners to go lower than they think.
The mistake I see is scenting the whole studio at one level. A reception is a thirty-second room and can carry a little presence. A consultation lounge is a three-hour room and needs a whisper. A newborn or maternity room should usually have nothing at all, and I would rather say that plainly than sell a second machine.
And the unglamorous part first: fragrance adds scent, it does not remove odour. If the studio smells of hairspray, of last night's crew dinner or of a room that has been shut since Sunday, scent laid on top makes a third smell. Find the source, air the room, clean it - and then, when the air is honest, give it a signature.
Frequently asked questions
Facts verified September 2026: SOSA Vaayu ₹11,999 is a waterless cold-air nebulising diffuser rated for approximately 1000 m3 of connected air, with Bluetooth app and timer, a 400ml tank, freestanding or wall / HVAC mounting and a DC 12V / 1A, 5W mains supply. SOSA Aangan ₹25,999 covers approximately 8,000 to 10,000 sq ft and SOSA Meenar ₹38,500 approximately 12,000 to 18,000 sq ft, both ducted into HVAC. The ultrasonic machines - Boond ₹899, Sukoon ₹1,899 and Megh ₹3,499 - run the water-based Hotel Collection fragrance from ₹299, with 100ml refills at ₹999; that water-based bottle is not used in a Vaayu or an HVAC machine. Reed diffusers start at ₹749 and last roughly 6-10 weeks. A coverage rating assumes one connected body of air; scent does not travel through a closed door. Ambient scent research supports improved evaluations of a space and its service, longer dwell and stronger recall at moderate effect sizes - it does not support claims about bookings, fees or retention. Fragrance adds scent and does not remove, neutralise or purify odour, and no SOSA product makes any health, antibacterial or air-purifying claim. SOSA blends are SOSA's own hotel-inspired interpretations; SOSA is independent and not affiliated with any hotel brand. Prices and availability are subject to change - see the live product pages.