The fifth product: a 300ml refill at ₹2,399, which fills a 130ml roughly twice.
The total: ₹4,196 + ₹2,399 = ₹6,595.
The room that gets nothing: the attached master bathroom.
2. The living-dining takes a 130ml at ₹1,349 on six reeds. With the foyer opening straight into it and no door between, this is about 295 sq ft of continuous air — roughly twice what one passive bottle is rated to hold in still conditions. One bottle placed near the foyer end will not charge all of it evenly and we are not going to say it does; what it does is own the first breath at the threshold and the seating half of the room. Mountain Breeze (Himalayan pine, sage, cedar) reads dry rather than sweet, which is what a room you also eat in wants.
3. The two bedrooms take different sizes for a reason that is not size. The master at 165 sq ft takes the 130ml at ₹1,299 on four reeds — most hours of any single room in the home, and four reeds carries that bottle past eighteen weeks. The second bedroom at 135 sq ft takes the 50ml at ₹799 on three reeds, which is not because it is much smaller — it is barely smaller — but because it is occupied fewer hours. If that room becomes a home office with somebody in it all day, promote it to a 130ml. Hours, not square feet, decides between the two sizes in the middle of the range.
4. Only one of your two bathrooms gets a bottle. The common bathroom at 40 sq ft takes a 50ml at ₹749 on two reeds — the cheapest complete air space in the home, entered by every visitor alone, with a door shut behind them and a nose that has not adapted. The attached master bathroom gets nothing, because its door stands open onto a bedroom with a 130ml three metres away for most of the day. That is a fact about your home rather than a rule, so check it: if that door genuinely stays closed, buy the ₹749 bottle and the list becomes ₹7,344. In most homes it does not.
5. The fifth product is a 300ml refill at ₹2,399, and it is the best-value item on the list. Run at the reed counts above, the four bottles give roughly 15, 19, 12 and 10 weeks — 56 room-weeks for ₹4,196, about ₹75 each. The refill fills a 130ml roughly twice, which is another 34 room-weeks for ₹2,399 — about ₹71 each. Without it, this is a home that stops in stages between weeks ten and nineteen and then needs ₹2,600 of new bottles. With it, the two main rooms run to about ten months.
Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
Five rooms, four bottles — and why the fifth product is not a room
Count the home properly first. This 1,000 sq ft flat has a 20 sq ft foyer opening without a door into a 275 sq ft living-dining, an 85 sq ft kitchen behind a door, a 165 sq ft master bedroom with a 45 sq ft bathroom attached, a 135 sq ft second bedroom, a 40 sq ft common bathroom and a 45 sq ft balcony — 810 sq ft of named spaces plus about 190 of walls and passage. Six doors close, so there are seven air spaces, of which the five in your question are the ones anybody occupies. Four of those five get a bottle. The one that does not is the attached bathroom, and the reason is a door that is open rather than a rule about bathrooms: fragrance passes freely through an open doorway, so a 45 sq ft room three metres from a 130ml is already inside that bottle's reach for most of the day. Buying it a bottle of its own would be paying ₹749 for air you are already charging.
The more interesting half of the question is what the fifth product should be, and the answer is decided by room-weeks rather than by rooms. Run at the reed counts these spaces actually want — six, four, three and two — the four bottles give roughly fifteen, nineteen, ten and twelve weeks each. That is 56 room-weeks for ₹4,196, or about ₹75 a room-week. A 300ml refill at ₹2,399 fills a 130ml roughly twice, which is another fifteen and nineteen weeks in the two rooms that matter most: 34 room-weeks for ₹2,399, about ₹71 each. It is cheaper per week of scented room than any bottle on the list, and it is the only purchase that protects the ones you have already made. Without it the home does not fade gently — it stops in stages. The second bedroom goes at about week ten, the common bathroom at twelve, the living-dining at fifteen and the master at nineteen, and somewhere in month four you are looking at ₹2,600 of replacement bottles you had not planned for.
The three decisions in a five-space home
One 50ml₹749Two bathrooms in one flat almost never deserve the same treatment. The common bathroom is entered by everybody, including visitors, alone, with the door shut — and at 40 sq ft it is roughly a quarter of a rated space, so a ₹749 bottle on two reeds owns it outright rather than being stretched across it. It is the cheapest complete air space in the home and it is on the list without argument. The attached master bathroom is a different object: 45 sq ft behind a door that in most homes stands open all day onto a bedroom with a 130ml in it. Go and look at yours. If it is open, buy nothing — the space is already served. If it is genuinely kept shut, ₹749 is fair and the list becomes ₹7,344.Every space in this home, priced
All seven air spaces plus the balcony, with what each gets. Three rows come to ₹0. The four bottle rows add up to ₹4,196, and the refill takes the list to ₹6,595.
| Space | What it needs | How many | Cost |
|---|---|---|---|
| Living-dining with the foyer open to it, about 295 sq ft ★ | One 130ml on six reeds near the foyer end — twice a rated space, so it anchors the threshold and the seating half rather than charging all of it | One | ₹1,349 |
| Master bedroom, about 165 sq ft, door closes | One 130ml on four reeds — most hours of any single room, and four reeds pushes it past eighteen weeks | One | ₹1,299 |
| Second bedroom, about 135 sq ft, door closes | One 50ml on three reeds — barely smaller than the master, but occupied for far fewer hours | One | ₹799 |
| Common bathroom, about 40 sq ft, door closes | One 50ml on two reeds — a quarter of a rated space, entered alone by every visitor | One | ₹749 |
| Attached master bathroom, about 45 sq ft | Nothing, if that door stands open — it is already inside the reach of the bedroom bottle. If it genuinely stays shut, ₹749 and the list becomes ₹7,344 | None | ₹0 |
| Kitchen, balcony and passage | Nothing, at any budget. Heat empties a bottle beside a hob and a working kitchen outruns any passive source; the balcony is outdoors; the passage is four seconds of occupancy | None | ₹0 |
| A note on all of the above: the fifth product on this list is not a space at all — a 300ml refill at ₹2,399, which fills a 130ml roughly twice and buys about 34 more room-weeks at roughly ₹71 each, cheaper per week than any bottle above. And every longevity figure here is steady-state: six reeds, a closed room, still air, a standard ceiling. Kolkata humidity, an open balcony or a fan running all night will all shorten them, and none of that is fixed by buying more. | |||
One room · the unitFrom ₹749Shop → 
Two rooms · better value₹1,498Shop → 
Large room · a switch₹1,899Shop →
Reeds, the two bathrooms, and when the refill actually goes in
Six, four, three and two — four different reed counts across four bottles. Reed count is the only volume control a reed diffuser has and it works in both directions at once: more reeds means a stronger room and a shorter bottle. Six in the living-dining, because 295 sq ft of open volume needs everything the bottle has and the room is met by arriving visitors. Four in the master, because a room you sleep in wants a level you notice on entering and forget while reading — and because four reeds carries a ₹1,299 bottle past eighteen weeks. Three in the second bedroom, which pushes a ₹799 bottle past ten. Two in the common bathroom, where three is a shop counter and two runs past twelve weeks. Fit them all, then leave the home alone for forty-eight hours: reeds have to saturate along their whole length before they throw properly. Judge each room from its doorway after half an hour outside, never from a chair inside it.
Then settle the attached bathroom by observation rather than by rule. Leave the door exactly as your household normally leaves it for a week. Then walk in from the bedroom and, separately, from the landing if there is another way in, and judge the first breath. In most Indian homes that door is open during the day and closed only in use, which means the room spends its life inside the bedroom bottle's reach and a second bottle three metres away would be buying a second origin in air already charged. If your household keeps it shut — common where the master bathroom is also the drying space — then it is genuinely separate air, a 50ml at ₹749 on two reeds is right, and the list becomes ₹7,344. This is the single place on the page where the answer depends on your habits rather than on your floor plan.
Then time the refill, because buying it early wastes it and buying it late costs more. On these reed counts the second bedroom finishes around week ten, the common bathroom around twelve, the living-dining around fifteen and the master past eighteen. Order the 300ml refill when the living-dining bottle is visibly low — around week thirteen or fourteen — because it fills a 130ml roughly twice and those are the two bottles worth refilling. The two 50ml are replaced rather than refilled at that stage; a 50ml is a different job. Refilling is also the moment to fit fresh reeds, since reeds clog over months as the heavier fragrance molecules saturate the fibre, and a throw that has dropped at week twelve is far more often clogged reeds than an empty bottle — you have four unused reeds sitting in every box. Keep every bottle on a tray or coaster, out of direct sun, out of an AC vent's stream and out of reach of children and pets; reed oil marks a polished finish permanently.
What to buy
Four of these five lines are bottles and the fifth is not. Every price is the real one, and the machine row is priced with the fragrance it needs rather than at its sticker.
| Buy | What it covers | Lasts | Price |
|---|---|---|---|
| One 50ml | A single reed diffuser — the second bedroom on three reeds at ₹799 and the common bathroom on two at ₹749 — two of your five products | 6–8 weeks | from ₹749 |
| One 130ml | The value size — the living-dining on six reeds at ₹1,349 and the master bedroom on four at ₹1,299 — the other two | 14–18 weeks | from ₹1,249 |
| The duo | Day & Night duo — the second bedroom and the common bathroom in one order, if you would rather not pick scents twice | 6–8 weeks each | ₹1,498 |
| Sukoon | 500ml ultrasonic — a living-dining you would rather switch on for guests than run constantly — ₹1,899 plus ₹299 of fragrance, so ₹2,198 | Runs when you switch it on | ₹1,899 |
| 300ml refill ★ | The running cost — the fifth product — 34 more room-weeks at about ₹71 each, the best value on this list | Roughly 2 × 130ml fills | ₹2,399 |
Versailles
The question arrives already answered: five rooms, five bottles. I would change two things about it. One of those rooms should get nothing, and one of the five products should not be a bottle at all. That gives you four diffusers and a refill, ₹6,595, and a home that is still working in month nine rather than month four.
The attached bathroom is the one people argue with, so please just go and look at the door. In nearly every home I have visited it stands open all day. A 45 square foot room three metres from a 130ml is inside that bottle's reach; buying it its own is paying ₹749 for air you are already charging. If your household keeps that door closed — and some do, especially where the clothes dry in there — then it is a real separate space and I would sell you the bottle happily.
And I would rather you bought the refill than a fifth bottle, even though the fifth bottle is the easier sale. Four bottles bought together give you about fourteen weeks before things start going out, and then you are facing two thousand six hundred rupees of replacements in a month you were not expecting it. One refill at ₹2,399 fills a 130ml twice over, keeps the two rooms that matter running to about ten months, and comes with the best excuse in the range to put fresh reeds in. That is the purchase I would make fifth. A portion of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
- A bedroom with an attached bathroom — why one of your two bathrooms is free.
- Refills for a four-room home in a year — the fifth product, over twelve months.
- The minimum before a home reads as intentional — how few is enough.
- The complete sizing and quantity guide — every home type, three builds.
- Brand: the SOSA founder story.
SOSA products & prices (verified August 2026): Hotel Collection water-based ultrasonic diffuser fragrance 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · Pack of 7 (15ml, all fragrances) ₹1,799; refills 100ml from ₹999. Seven scents: The Ritz-Carlton-inspired (white tea · bergamot · cedar), Westin-inspired (white tea · aloe · cedar), 1 Hotels-inspired (cedarwood · vetiver · green leaves), The St. Regis-inspired (amber · violet · woods), Shangri-La-inspired (jasmine · green tea · white tea), Four Seasons-inspired (citrus · floral · sandalwood), W Hotels-inspired (citrus · pepper · amber). Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499. Water-based, phthalate-free, composed to IFRA standards for home diffusion; 3–6 drops per tank. Made in India, Pune. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; all hotel names are trademarks of their respective owners and are used only to describe the scent style — SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. Prices and availability subject to change — see the live product pages.