Year two: liquid only — one 500ml and two 300ml = ₹8,297. The glass is already yours.
Per room-week: about ₹68 in year one and ₹53 in year two, across 156 room-weeks.
2. The year consumes about 1,170ml, which is the number everything else follows from. A 130ml run on the middle of its 14–18 week range lasts sixteen weeks, so a room needs 52 ÷ 16 = 3.25 fills a year — 422.5ml. Two such rooms is 845ml. A 50ml on two reeds in a bathroom, taken at the top of its 6–8 week range, needs 6.5 fills — 325ml. 845 + 325 = 1,170ml. The three bottles supply 310ml of that, so 860ml has to be bought as refill.
3. Year two is ₹8,297, because you are no longer buying glass. The same 1,170ml is needed, less the 40ml you carried over, so 1,130ml. One 500ml refill at ₹3,499 and two 300ml at ₹2,399 gives 1,100ml for ₹8,297, and the carried-over 40ml makes 1,140ml against 1,130ml required. That is ₹2,247 less than year one, a drop of about 21 per cent.
4. The ₹2,247 gap breaks down exactly. About ₹867 is the premium on buying 310ml inside glass bottles rather than as refill liquid — ₹3,347 against ₹2,480 at ₹8.00 a millilitre. About ₹880 is buying 110ml less packaged volume. And ₹500 is the 500ml pack at about ₹7.00 a millilitre instead of ₹8.00. ₹867 + ₹880 + ₹500 = ₹2,247.
5. Per room-week it is ₹68, then ₹53. Three rooms across 52 weeks is 156 room-weeks. ₹10,544 ÷ 156 ≈ ₹68; ₹8,297 ÷ 156 ≈ ₹53. Both are below the ₹78 a week a 130ml bottle costs on its own, and the reason is simply that refills are cheaper liquid than bottles are.
Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
What a year actually consumes, and why the bottle price misleads
Almost every discussion of what home fragrance costs stops at the shelf price, and the shelf price is a fraction of the answer. Three bottles at ₹3,347 buy you 310ml of fragrance — 130 + 130 + 50 — and three pieces of glass. Three hundred and ten millilitres does not last a year in three occupied rooms. It lasts about sixteen weeks in the living room, sixteen in the bedroom and eight in the bathroom, at which point every bottle is empty and the year is a quarter over. What you actually buy across twelve months is roughly 1,170ml, and the arithmetic is straightforward: a 130ml at sixteen weeks needs 52 ÷ 16 = 3.25 fills, or 422.5ml a room, so two rooms is 845ml; a 50ml at eight weeks needs 6.5 fills, or 325ml. 845 + 325 = 1,170.
The second thing the shelf price hides is that the same millilitre costs three different amounts depending on how it arrives. Inside a 130ml bottle at ₹1,249 it is about ₹9.61; inside a 50ml at ₹799 it is about ₹15.98, because the glass, collar and reeds are a fixed cost spread over a fifth as much liquid. In a 300ml refill at ₹2,399 it is about ₹8.00, and in a 500ml at ₹3,499 about ₹7.00. That spread is the whole reason year two is cheaper than year one: nothing about the household changes, but you stop buying containers you already own. The three bottles in the opening purchase work out at ₹3,347 for 310ml, which is about ₹10.80 a millilitre — the dearest liquid you will buy all year, and unavoidable, because you have to own the glass before you can refill it. It is worth noticing which room that penalty lands hardest on. The 50ml in the bathroom is ₹799 for 50ml, and it is by some distance the most expensive liquid in the house — yet it is still the right bottle for that room, because a 130ml on two reeds would take well over a year to finish and the blend would age in the glass while it waited. The per-millilitre figure is a fact about packaging, not a rule about what to buy: it tells you to refill that 50ml from a 300ml pack rather than replace it six times, which turns its worst line into one of the better ones.
Year one, year two, and the gap between them
Three bottles₹3,347The opening purchase is ₹1,249 + ₹1,299 + ₹799 = ₹3,347. Those bottles hold 310ml of the 1,170ml the year needs, leaving 860ml to buy as refill. Three 300ml packs give 900ml for ₹7,197, which covers it with 40ml to spare. ₹3,347 + ₹7,197 = ₹10,544. Priced purely at the refill rate the year would be ₹10,227; the ₹317 difference is the 40ml you have not used and will carry into January.The itemised list, room by room
First-year cost per room, bottle plus the refill liquid that room drinks. The last two rows are the ones that keep the total where it is.
| Space | What it needs | How many | Cost |
|---|---|---|---|
| Living room, six reeds, 130ml Morning Freshness ★ | Bottle ₹1,249, plus 292.5ml of refill at ₹8.00 a millilitre to reach 422.5ml for the year | 1 bottle + 292.5ml | ₹3,589 |
| Main bedroom, four reeds, 130ml Evening Calm | Bottle ₹1,299, plus the same 292.5ml of refill. Four reeds may stretch it further and cut this line | 1 bottle + 292.5ml | ₹3,639 |
| Small bathroom, two reeds, 50ml Garden Bloom | Bottle ₹799, plus 275ml of refill to reach 325ml. The dearest glass per millilitre in the house | 1 bottle + 275ml | ₹2,999 |
| The same bathroom, run only six months of the year | Removes about 162ml, and in most homes nobody notices the six months it is off. The cheapest line to cut | 1 bottle + 112ml | ₹1,699 |
| Kitchen | Nothing. A working kitchen has strong smells and extraction of its own, and a passive bottle is outgunned there at any budget | None | ₹0 |
| Passage, landing or a guest room used a few nights a year | Nothing. Adding a fourth room here would add roughly ₹3,600 a year for a space nobody stands in | None | ₹0 |
| A note on all of the above: ₹3,589 + ₹3,639 + ₹2,999 = ₹10,227, which is the year priced at the ₹8.00 refill rate. Buying whole packs — three 300ml refills at ₹2,399 — makes the actual bill ₹10,544, and the ₹317 difference is 40ml of liquid you carry into the following year. All of it assumes 16 weeks for a 130ml and 8 for a 50ml on a low reed count, in closed rooms of standard ceiling height. | |||
One room · the unitFrom ₹749Shop → 
Two rooms · better value₹1,498Shop → 
Large room · a switch₹1,899Shop →
The assumptions behind these totals, and how to make them smaller
The band, stated honestly. Everything above takes a 130ml at sixteen weeks and a 50ml at eight, which is the middle of one range and the top of the other. Run the bottles harder — six reeds everywhere, a warm flat, a bottle in the sun — and you land at fourteen and six weeks, which is about 1,400ml a year and around ₹11,200 of liquid at the refill rate. Run them gently — four reeds in the bedroom, everything shaded — and you land nearer eighteen and eight, about 1,080ml, or roughly ₹8,640. That spread is about ₹2,560, and you control most of it.
The three cheapest reductions, in order. First, take rooms off the list: a fourth room at this standard adds roughly ₹3,600 a year, which is more than any efficiency you can find elsewhere. Second, drop the reed count where the room allows — four in the bedroom instead of six pushes a 130ml past eighteen weeks and takes a couple of hundred millilitres off the year. Third, let the bathroom lapse for part of the year; running it six months instead of twelve removes about 162ml, roughly ₹1,300, and in most households nobody remarks on the months it is off.
And buy the liquid in the right shape. Once you own the glass there is no reason to buy fragrance inside a bottle again, and a 500ml refill at ₹3,499 is about ₹7.00 a millilitre against ₹8.00 for the 300ml and ₹9.61 for the liquid inside a new 130ml. Fit fresh reeds every time you pour — a 130ml fill is roughly ₹1,040 of fragrance and a sixteen-week-old wick will waste most of it, which is the one way to spend all of the money above and get a noticeably worse result.
What to buy
The opening purchase is three bottles; everything after that is liquid. The table is what each line costs and how long it lasts.
| Buy | What it covers | Lasts | Price |
|---|---|---|---|
| One 50ml | A single reed diffuser — the bathroom — ₹799 of glass, and about ₹15.98 a millilitre, which is why it is the smallest bottle you buy | 6–8 weeks | from ₹749 |
| One 130ml | The value size — the living room and bedroom at ₹1,249 and ₹1,299, about ₹9.61 a millilitre inside the glass | 14–18 weeks | from ₹1,249 |
| The duo | Day & Night duo — two of the three rooms opened in one purchase, if you would rather start the year in one go | 6–8 weeks each | ₹1,498 |
| Sukoon | 500ml ultrasonic — a large room where three reed bottles were never going to be the right shape of answer | Runs when you switch it on | ₹1,899 |
| 300ml refill ★ | The running cost — every millilitre after the first 310 — about ₹8.00, and roughly ₹7.00 in the 500ml pack | Roughly 2 × 130ml fills | ₹2,399 |
Versailles
I would rather publish this number than have somebody discover it in October. Three bottles is ₹3,347; the year is ₹10,544. Nobody in this industry advertises the second figure, because it is three times the first and it does not fit on a product page. But it is the number you are actually agreeing to when you decide to keep three rooms scented, and you deserve to see it before you start rather than after.
The good news is the shape of it. Year two is ₹8,297 for exactly the same house, because the glass and the collars were always the durable part and you only pay for them once. Refill liquid is about ₹8.00 a millilitre against roughly ₹10.80 for the liquid that arrives inside bottles, and in a 500ml pack it is nearer ₹7.00. Most of what makes home fragrance feel expensive is people rebuying containers they already own.
If ₹10,544 is more than you want to spend — and for plenty of people it will be — the honest answer is not a cheaper bottle. It is fewer rooms and fewer reeds. Two rooms instead of three takes about ₹3,000 off, four reeds instead of six takes another slice, and letting the bathroom lapse over the monsoon takes about ₹1,300 more. I would far rather you ran two rooms properly all year than three rooms guiltily until March. A portion of every order supports girl-child education through Nanhi Kali.
Frequently asked questions
- Budgeting across a full year — the planning version.
- Four bottles for a year — the same maths, one room more.
- A whole home under ₹2,500 — the opening purchase, worked.
- How to stop overspending — the four ways money leaks.
- 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.