★ SOSA reed diffusers · longevity vs output
A reed diffuser cannot last longer and smell the same. If yours is beating its stated weeks, find out which end of the trade you are on
★ ★ ★ ★ ★
★★★★★
"Four months out of a 50ml sounded like a win until I read this. It was a stalled bottle, not a bargain. Flipping fixed it in a day."
Evening Calm 50ml
★★★★★
"My 130ml at week sixteen still smells right, and now I know that is the plateau doing its job rather than luck."
Mountain Breeze 130ml
★★★★★
"I ran four reeds instead of six for months and wondered why it was so gentle. It was gentle because I made it gentle."
Morning Freshness 50ml
★★★★★
"The idea that the oil and the room are the same account, just read from opposite ends, made everything click for me."
Fresh Brew 50ml
★★★★★
"My husband kept saying the house smelled of coffee and I could not smell a thing. Turns out I was the faulty instrument."
Fresh Brew 130ml
★★★★★
"Stopped rationing it. Six reeds, flipped weekly, on the console by the door — and it finally smells like the shop did."
Garden Bloom 50ml
★★★★★
"Four months out of a 50ml sounded like a win until I read this. It was a stalled bottle, not a bargain. Flipping fixed it in a day."
Evening Calm 50ml
★★★★★
"My 130ml at week sixteen still smells right, and now I know that is the plateau doing its job rather than luck."
Mountain Breeze 130ml
★★★★★
"I ran four reeds instead of six for months and wondered why it was so gentle. It was gentle because I made it gentle."
Morning Freshness 50ml
★★★★★
"The idea that the oil and the room are the same account, just read from opposite ends, made everything click for me."
Fresh Brew 50ml
★★★★★
"My husband kept saying the house smelled of coffee and I could not smell a thing. Turns out I was the faulty instrument."
Fresh Brew 130ml
★★★★★
"Stopped rationing it. Six reeds, flipped weekly, on the console by the door — and it finally smells like the shop did."
Garden Bloom 50ml
✓ 50ml lasts 6–8 weeks · 130ml lasts 14–18 weeks · both at six reeds, flipped weekly ✓ Six fibre reeds per bottle · alcohol-free, phthalate-free, low-VOC CCT base ✓ Composed and handmade in small batches in Pune · free shipping above ₹499
Founder Diaries · Reed Diffusers · Longevity vs output
The legitimate long bottle: a 130ml at 14–18 weeks, or a deliberately low reed count, or a cold sealed room. All three still smell of something when you walk in from outside.
The one-question test: does a visitor who has just arrived notice it? If yes, you have a genuine long plateau. If no, you have a stall.
What it is not: a weak batch. Our compositions run flatter and longer by design because there are no phthalate solvents pushing them off the reed. The trade is a smaller opening for a longer plateau.
Evening Calm₹799 · 8.9/10Our 50ml is rated 6–8 weeks and the 130ml 14–18, both at six reeds, flipped weekly, in an ordinary room without a draught. When somebody tells me their 50ml is on month four with oil to spare, I do not congratulate them. I assume the reeds stalled somewhere around week three and have been decorative ever since. The signature is unmistakable once you know it: the level almost unchanged for weeks, the reeds darker and heavier than they started, the wet line sitting high near the top, and a reed that smells thick and muted rather than clean when you hold it close. Nobody notices at the time, because the decline is gradual and your nose adapts along with it. What people notice is the anomaly in the accounts — the bottle that will not empty — and by then it has usually been quiet for a month.
SOSA reed diffuser range & prices (verified August 2026): alcohol-free, phthalate-free, paraben-free and IFRA-compliant compositions on a heat-stable coconut-derived (CCT) carrier, low-VOC, supplied in a refillable glass bottle with six fibre reeds; 50ml lasts 6–8 weeks and 130ml lasts 14–18 weeks. Morning Freshness (Malabar lemon · peppermint · Nilgiri eucalyptus) 50ml ₹749 · 130ml ₹1,249 · 9.0/10; Garden Bloom (British rose · night-blooming jasmine) 50ml ₹799 · 130ml ₹1,299 · 8.9/10; Evening Calm (Kashmir lavender · chamomile) 50ml ₹799 · 130ml ₹1,299 · 8.9/10; Fresh Brew (Coorg coffee · Kerala vanilla) 50ml ₹849 · 130ml ₹1,349 · 9.5/10; Mountain Breeze (Himalayan pine · sage · Indian cedar) 50ml ₹849 · 130ml ₹1,349 · 9.4/10. Reed diffuser refills are oil only — you reuse your own vessel and reeds: 300ml ₹2,399 (roughly 8–11 months) · 500ml ₹3,499 (roughly 14–18 months), about ₹7–8 per ml against ₹15–17 per ml for a 50ml bottle. Duo sets ₹1,498–₹1,598 for 2 × 50ml and ₹2,498–₹2,598 for 2 × 130ml. Strength figures are positions on SOSA’s own internal strength scale, not an industry standard. Replacement reeds are not sold as a separate SKU; SOSA guidance is to refresh reeds every few months. The reed line is separate from the water-based Hotel Collection for ultrasonic machines (15ml ₹299 · 100ml ₹999 · 300ml ₹1,799) and the two are not interchangeable. Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499 · waterless Vaayu ₹11,999. Composed and handmade in small batches in Pune, India; tested through 45°C summer heat and 85% monsoon humidity. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. Prices subject to change — see the live product pages.
Two sentences arrive together in my inbox more often than any other pair: it is lasting brilliantly, and I can hardly smell it. People write them as though they were unrelated observations — one a compliment, one a complaint. They are the same observation. The oil in the bottle and the fragrance in the room are a single account read from opposite ends, and every millilitre still sitting in the glass at week twelve is a millilitre that did not reach you. A reed diffuser cannot last longer and smell the same; that trade does not exist in this format.
Quick answers — read this first
The inverse pathology: a 50ml stretching to four or five months is not a well-made bottle. It is a bottle whose reeds stopped delivering, usually around week three.The legitimate long bottle: a 130ml at 14–18 weeks, or a deliberately low reed count, or a cold sealed room. All three still smell of something when you walk in from outside.
The one-question test: does a visitor who has just arrived notice it? If yes, you have a genuine long plateau. If no, you have a stall.
What it is not: a weak batch. Our compositions run flatter and longer by design because there are no phthalate solvents pushing them off the reed. The trade is a smaller opening for a longer plateau.
The short answer
Short answer: because longevity and output are not two features you can have separately — they are the same throughput measured at each end. If your bottle is outliving its stated window and the room is quiet, the reeds have almost certainly stalled: the exposed ends have loaded up with the heavy part of the composition and stopped releasing. Flip all six with gloves on and give the room a full evening. That single free action resolves the large majority of these cases.
The mechanism: oil climbs the fibre and evaporates from the exposed end, and the rate at which it does that is both numbers at once. Halve the release rate and you double the bottle life and halve the room. This is why "it lasts forever" and "I cannot smell it" are not two problems to be solved separately; solve one and you necessarily unsolve the other.
Shop: if the diagnosis is a genuinely quiet composition in a room that needs more, move up the scale rather than up in size — Fresh Brew at 9.5/10 or Mountain Breeze at 9.4/10, ₹849 for 50ml. For two rooms rather than one loud one, the Warmth & Bloom duo is ₹1,598 for 2 × 50ml. Free shipping above ₹499.
In this guide
If the composition is the quiet part
Fresh Brew 9.5 · from ₹849
More sources, not more oil
Warmth & Bloom duo · ₹1,598
Once the reeds have run their course
300ml oil refill · ₹2,399
Straight answer
Why does my reed diffuser last for months but barely smell of anything?
1. Because those are the same fact, not two facts. The bottle empties at exactly the rate the room receives fragrance. If the emptying has slowed to a crawl, the receiving has too — there is no mechanism by which a reed diffuser quietly banks fragrance for later.
2. The usual culprit is a stall, and it is free to clear. Reeds that have not been turned accumulate the heavy, low-volatility fraction at the exposed end until the surface effectively seals. Flip all six, gloves on, and judge the room the next evening rather than in the next five minutes.
3. The second culprit is a reed count you chose without realising. Four reeds instead of six is a deliberate quiet setting: gentler room, longer bottle. If you removed two reeds to make it last, it lasted. That was the deal.
4. The third is dead air. A bottle in an alcove, behind a sofa or inside a cabinet holds its level well because nothing is carrying anything away. Move it into gentle passing traffic near a doorway, waist to chest height, several feet clear of an AC vent or fan.
5. Rule your own nose out before you rule the bottle out. Olfactory adaptation is the commonest cause of "it stopped working" and it bites hardest at home, on a constant, low background — which is precisely what this format produces. Ask someone who has just walked in.
6. If a visitor smells it and you want more anyway, that is a composition decision. Evening Calm at 8.9 on our internal scale is the softest thing we make and is meant to be; Fresh Brew at 9.5 is a different room entirely.
7. Do not buy a 130ml to fix this. It lasts 14–18 weeks against 6–8 and at six reeds projects the same. You would be buying more of the quantity you already have too much of.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. The usual culprit is a stall, and it is free to clear. Reeds that have not been turned accumulate the heavy, low-volatility fraction at the exposed end until the surface effectively seals. Flip all six, gloves on, and judge the room the next evening rather than in the next five minutes.
3. The second culprit is a reed count you chose without realising. Four reeds instead of six is a deliberate quiet setting: gentler room, longer bottle. If you removed two reeds to make it last, it lasted. That was the deal.
4. The third is dead air. A bottle in an alcove, behind a sofa or inside a cabinet holds its level well because nothing is carrying anything away. Move it into gentle passing traffic near a doorway, waist to chest height, several feet clear of an AC vent or fan.
5. Rule your own nose out before you rule the bottle out. Olfactory adaptation is the commonest cause of "it stopped working" and it bites hardest at home, on a constant, low background — which is precisely what this format produces. Ask someone who has just walked in.
6. If a visitor smells it and you want more anyway, that is a composition decision. Evening Calm at 8.9 on our internal scale is the softest thing we make and is meant to be; Fresh Brew at 9.5 is a different room entirely.
7. Do not buy a 130ml to fix this. It lasts 14–18 weeks against 6–8 and at six reeds projects the same. You would be buying more of the quantity you already have too much of.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: a bottle that lasts unusually long and smells of little has not found a loophole — it has stopped delivering. Flip all six reeds, move it into passing air, ask a visitor. If they smell it and you do not, the bottle is fine and your nose has adapted.
When the verdict is "working, but quieter than this room needs"
SOSA Fresh Brew · Coorg coffee & Kerala vanilla ₹849 / 50ml
The fullest presence in our range at 9.5 on SOSA's own internal scale, measured at six reeds — not a concentration and not a quality ranking, simply how loudly it reads in an ordinary Indian room. Roasted Coorg coffee over Kerala vanilla, warm and enveloping rather than sweet. If your audit says the bottle is delivering properly and the room still wants more, this is the honest upgrade: a louder composition, not a larger bottle. 130ml ₹1,349 for 14–18 weeks.
Part one — one account, read from two ends
Think of the bottle as a bank balance and the room as the spending. There is no third place for the money to go. Whatever leaves the glass arrives in the air; whatever stays in the glass has not arrived anywhere. That sounds obvious written down, and yet the entire category is sold on the fiction that longevity and strength are separate features you might get more of at once. They are not. They are one number — throughput — with a plus sign on one side and a minus sign on the other, and every honest lever in this format moves both at once, in opposite directions. Once you accept that, "lasting well but smelling of nothing" stops being a puzzle and becomes a simple question: which side of the trade am I on, and did I choose it?
1
THE SYMMETRY
Every lever moves both numbers, always in opposite directions
Add reeds and the room gets louder while the bottle gets shorter. Take reeds out and the bottle stretches while the room goes quiet. Move the bottle into moving air and both rise; tuck it into an alcove and both fall. Warm it in the sun and the oil thins and runs out early. There is not a single adjustment available to you that raises output without spending weeks, or saves weeks without lowering output — which means the sentence "it lasts for ages and smells of nothing" describes a bottle sitting at the far conservative end of that dial, whether or not anybody put it there on purpose. The only genuine escape is more sources: a second bottle in a second place raises the total output of the house without asking any single bottle to work harder than it can.
The rule: if your bottle is beating its stated weeks by a wide margin, something is paying for it. Find out what.
2
THE PATHOLOGY
The stall — a 50ml that reaches month four
Evening Calm₹799 · 8.9/10Our 50ml is rated 6–8 weeks and the 130ml 14–18, both at six reeds, flipped weekly, in an ordinary room without a draught. When somebody tells me their 50ml is on month four with oil to spare, I do not congratulate them. I assume the reeds stalled somewhere around week three and have been decorative ever since. The signature is unmistakable once you know it: the level almost unchanged for weeks, the reeds darker and heavier than they started, the wet line sitting high near the top, and a reed that smells thick and muted rather than clean when you hold it close. Nobody notices at the time, because the decline is gradual and your nose adapts along with it. What people notice is the anomaly in the accounts — the bottle that will not empty — and by then it has usually been quiet for a month.
The tell: a bottle beating its window by more than half again, with reeds that have not been flipped. Flip all six and wait one evening.
3
THE LEGITIMATE LONG BOTTLE
When lasting well is exactly what it looks like
There are three honest ways to have a long bottle, and all three come with a room that still smells of something. The first is simply the larger size: a 130ml is designed for 14–18 weeks, and at week fifteen it should smell much as it did at week four. The second is a deliberately low reed count — four instead of six is a real setting, chosen by people who want a gentle bedroom or a nursery, and it will comfortably outrun the stated window. The third is a cool, closed, low-traffic room, where evaporation genuinely runs slower. What separates all three from a stall is that a visitor can still smell them. That is the whole distinction, and it costs nothing to check: open a window for a few minutes, step outside for ten, or wait until somebody arrives, and trust their nose over yours.
Part two — the two ways a bottle reaches week twelve
Two bottles, same shelf, same date, both still holding oil at week twelve. One is healthy and one has stopped. Nothing in the level distinguishes them; almost everything else does. Read down the column that matches what you are seeing.
Same reading, opposite meaning
A bottle that is genuinely lasting against one that has stalled
| Marker at week twelve | Genuinely lasting | Stalled | How to check it at home |
|---|---|---|---|
| A visitor's first reaction ★ | Notices the scent within a few seconds of coming in | Says nothing; says so honestly when asked | Ask outright, before you tell them what it should smell of |
| The reed held a few inches from your nose | Reads clearly as the composition you bought | Thick, dull, faintly like nothing in particular | Gloves on, lift one, hold it up, then put it back |
| Colour and feel of the reeds | Evenly tinted, still flexible | Noticeably darker at the exposed end, tacky | Compare against an unused reed if you kept one |
| Response to a flip | A modest lift for a day or two, then back to plateau | A pronounced return of scent within hours | Flip all six and judge the following evening |
| Which size it is | Usually a 130ml, rated 14–18 weeks | Usually a 50ml, rated 6–8 weeks, on month three | Check the bottle against its stated window |
| Coming back after an hour out | The room greets you | The room is neutral | Close the door for an hour, go out, come back in |
| The honest caveat: the strongest evidence on this table is other people's noses, and that is inconvenient advice. Your own nose is a poor instrument here — not because there is anything wrong with it, but because it is designed to stop reporting constants and it adapts hardest in your own home, where the background never changes. If you live alone and rarely have visitors, use the hour-out test instead, and take the reed test seriously. | |||
Shop this guide
The three verdicts, and what each one needs
The SOSA principle
You cannot buy longevity and presence separately. They are one number with two signs.
The only way to raise the total fragrance a home receives without shortening any bottle is to add a second source in a second place. Output per bottle is fixed by physics; the number of bottles is not.
Part three — the plateau, and the pride that hides a stall
Every reed diffuser follows the same three-phase curve. Days one to three are a spike, because the reeds are dry and drinking hard and the lightest top notes are leaving all at once. Weeks one to two are a settle, as that first rush finishes and the composition finds its working level. Then comes the plateau, and the plateau is the product — a steady, low, constant background that should hold, with weekly flipping, right through to the end of the bottle. A healthy plateau is quiet by design. That is exactly what makes a stall so hard to catch: the difference between a working plateau and a dead one is not dramatic on any single day, and your nose is adapting to both.
This is where I have to be honest about a choice we made. Phthalate solvents push fragrance off a reed hard and fast; they win week one convincingly, and in Indian conditions they degrade in heat and turn acrid somewhere around week six. We do not use them. Our compositions sit on a heat-stable coconut-derived CCT base, alcohol-free and phthalate-free, and the trade we accepted is a smaller opening in exchange for a longer, flatter plateau that survives a 45°C summer and 85% monsoon humidity without turning. Some customers who have come from a hard-pushing imported diffuser read that flatness as weakness in the first fortnight. It is not weakness; it is the same total fragrance, spread more evenly and held stable rather than spent up front. But it does mean our bottles feel calm, and a calm bottle and a stalled bottle look similar from the sofa.
So the discipline I would ask for is this: judge by delivery, not by inventory. A slow-emptying bottle is a hypothesis, not a diagnosis. Test it with the reed in your hand and with somebody else's nose, and then act on what those tell you. If the tests say the bottle is delivering and you simply want more of it, the honest levers are the ones this brand keeps repeating — more reeds if you accept a shorter bottle, better placement if it is currently in dead air, a louder composition if the room needs one, or a second bottle at the other end of an open plan. And if what you actually want is a room that smells strongly on demand rather than constantly and quietly, the reed format is the wrong tool and a Sukoon at ₹1,899 is the right one. Most homes end up running both, because they do genuinely different jobs.
Oil that outlives its window has not saved you anything. It has simply gone unspent.
— Sonal Sahani, SOSA
Part four — the output audit, and what each verdict buys
Run the four checks in the table above, then find your verdict below. Two of the five rows cost nothing at all, and they are the two that apply to most people who arrive at this article.
The output audit
What your verdict means, and what I would do about it
| Your verdict | What I would actually do | Price | Why not the obvious alternative |
|---|---|---|---|
| Reeds stalled — a flip brings it back ★ | Flip all six weekly, gloves on, and put it in the diary | Free | A new bottle would stall the same way in the same fortnight |
| Reeds old — a flip brings back nothing | Fresh reeds and top the oil to the neck | 300ml refill ₹2,399 · roughly 8–11 months | Replacing the oil alone leaves the worn part of the system in place |
| Dead air — strong at the bottle, absent at the sofa | Move to a console near a doorway, waist to chest height | Free | More oil into a still corner produces more still oil |
| Adaptation — visitors smell it, you do not | Nothing. Or alternate two scents between rooms | Free, or a duo at ₹1,598 | Buying stronger fragrance to beat your own nose is a losing race |
| Composition too quiet for the room | Fresh Brew 9.5 or Mountain Breeze 9.4 | From ₹849 · 50ml | A 130ml of the same scent gives you 14–18 weeks, not more volume |
| Room simply too large — beyond roughly 250–300 sq ft of open volume | Two bottles at opposite ends, or a Sukoon | From ₹1,498 for a duo · Sukoon ₹1,899 | A third reed bottle in the middle is the expensive way to learn this |
Honest notes for buyers: the 6–8 and 14–18 week figures are SOSA working guidance from in-house testing, measured at six reeds with weekly flipping in an ordinary room — not a warranty, and genuinely variable with heat, draught, traffic and season. Strength positions such as 9.5 and 8.9 are points on our own internal scale at six reeds; they are not an industry standard, not a concentration and not a quality ranking. Refills are oil only — you reuse your own vessel and reeds — and we do not sell replacement reeds as a separate item, which is an honest gap in the range; our guidance is to refresh reeds every few months. There is also no oud, no musk-forward scent and no aquatic in the reed line. Reed oil never goes into a Sukoon, Boond or Megh, and the water-based Hotel Collection never goes into a reed bottle. Stand the bottle on a tray, keep it out of direct sun, and keep it away from children and pets. Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
The only way to raise total output without shortening a bottle
SOSA Warmth & Bloom duo · Fresh Brew + Garden Bloom ₹1,598 / 2 × 50ml
Output per bottle is fixed; the number of bottles is not. Two sources in two places give a home more fragrance without asking either one to run hot and finish early — and these two are built to sit near each other, meeting on warmth and a soft musk rather than colliding. Fresh Brew at 9.5 and Garden Bloom at 8.9 on our internal scale, six fibre reeds each, 6–8 weeks per 50ml. Also available as 2 × 130ml at ₹2,598 for 14–18 weeks.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
Early on, we treated long bottle life as a selling point and put it near the top of the page. It tested well. Then I started reading the messages that came back six months later, and a pattern appeared that I did not enjoy: the customers who told us the bottle lasted longest were disproportionately the ones who could no longer smell it. We had accidentally taught people to be proud of a stall.
So we changed how we talk about it. Duration is now stated as a specification — 6–8 weeks for the 50ml, 14–18 for the 130ml, at six reeds, flipped weekly — rather than as a virtue. A bottle that beats those numbers substantially is not over-performing. It is under-delivering, and it is worth thirty seconds of your attention to find out which.
I would rather sell you a 50ml every seven weeks that fills your hallway than a 50ml every five months that sits there looking full. The oil is not the thing you bought. The room is the thing you bought. Everything is composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
Frequently asked questions
Is it bad if my reed diffuser lasts longer than the stated weeks?
Not necessarily, but it needs checking. A 130ml at week sixteen is doing exactly what it should. A 50ml on month four, in a room nobody comments on, has almost certainly stalled. The test is not the calendar, it is whether a visitor notices the scent when they walk in.
Can a reed diffuser last a long time and still smell strong?
Only by choosing the larger size, which gives you 14–18 weeks instead of 6–8 at the same projection. Within a single bottle, longevity and output are the same throughput and move in opposite directions — more reeds means a louder room and a shorter bottle, fewer means the reverse. Anyone promising both at once is not describing this format.
My diffuser smelled strong for the first week and then went quiet. Is that a stall?
Usually not — that is the normal curve. Days one to three spike because the reeds are dry and the top notes are leaving; weeks one to two settle; then the plateau holds to the end of the bottle. The plateau is the product and it is meant to be lower than the opening. A stall is different: it keeps declining past the settle, and a flip brings it noticeably back.
Should I use fewer reeds to make it last longer?
You can, and it works — four instead of six gives a gentler room and a bottle that outruns its stated window. Just do it knowingly. Most people who complain that a diffuser lasts forever and smells of nothing have made exactly this trade without realising they made it, usually by leaving reeds out of the packet.
Would a bigger bottle give me more fragrance in the room?
No. A 130ml at ₹1,249–₹1,349 holds more oil and lasts 14–18 weeks against 6–8, but at six reeds it projects the same as the 50ml. If the room is the problem, the answers are reed count, placement, a louder composition, or a second bottle somewhere else — not a taller bottle in the same spot.
Longevity vs output · 2027
A bottle that lasts and a bottle that delivers are the same bottle — find out which end of the trade you are on
50ml from ₹749 for 6–8 weeks, 130ml from ₹1,249 for 14–18 weeks, six fibre reeds in every bottle on an alcohol-free, phthalate-free CCT base. Two sources beat one loud one: duo sets from ₹1,498 for 2 × 50ml. Oil-only refills ₹2,399 for 300ml. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
Shop by strength → Duo sets from ₹1,498
Continue the read
More on the bottle that will not empty
- Why is my oil not going down? — the three states, and the thirty-second triage.
- Does slow evaporation mean it isn't working? — what to measure instead of the level.
- Barely evaporating? and reeds not absorbing enough oil.
- The complete guide to a diffuser that lasts too long, and the complete strength guide.
- Brand: the SOSA founder story.
Editorial standards & sources
About this guide: Written by Sonal Sahani, ISIPCA Versailles-trained founder and perfumer at SOSA Home & Body, on why a long-lasting reed diffuser and a quiet room are usually the same finding. Bottle-life windows are SOSA's own working guidance from in-house testing and customer correspondence, measured at six reeds with weekly flipping; the descriptions of stalled versus healthy plateau behaviour are likewise SOSA working guidance rather than laboratory measurement, and results vary with room volume, ventilation, traffic and season. Strength ratings are positions on SOSA's internal scale at six reeds, not an industry standard.SOSA reed diffuser range & prices (verified August 2026): alcohol-free, phthalate-free, paraben-free and IFRA-compliant compositions on a heat-stable coconut-derived (CCT) carrier, low-VOC, supplied in a refillable glass bottle with six fibre reeds; 50ml lasts 6–8 weeks and 130ml lasts 14–18 weeks. Morning Freshness (Malabar lemon · peppermint · Nilgiri eucalyptus) 50ml ₹749 · 130ml ₹1,249 · 9.0/10; Garden Bloom (British rose · night-blooming jasmine) 50ml ₹799 · 130ml ₹1,299 · 8.9/10; Evening Calm (Kashmir lavender · chamomile) 50ml ₹799 · 130ml ₹1,299 · 8.9/10; Fresh Brew (Coorg coffee · Kerala vanilla) 50ml ₹849 · 130ml ₹1,349 · 9.5/10; Mountain Breeze (Himalayan pine · sage · Indian cedar) 50ml ₹849 · 130ml ₹1,349 · 9.4/10. Reed diffuser refills are oil only — you reuse your own vessel and reeds: 300ml ₹2,399 (roughly 8–11 months) · 500ml ₹3,499 (roughly 14–18 months), about ₹7–8 per ml against ₹15–17 per ml for a 50ml bottle. Duo sets ₹1,498–₹1,598 for 2 × 50ml and ₹2,498–₹2,598 for 2 × 130ml. Strength figures are positions on SOSA’s own internal strength scale, not an industry standard. Replacement reeds are not sold as a separate SKU; SOSA guidance is to refresh reeds every few months. The reed line is separate from the water-based Hotel Collection for ultrasonic machines (15ml ₹299 · 100ml ₹999 · 300ml ₹1,799) and the two are not interchangeable. Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499 · waterless Vaayu ₹11,999. Composed and handmade in small batches in Pune, India; tested through 45°C summer heat and 85% monsoon humidity. Free shipping above ₹499. A portion of every order supports girl-child education through Nanhi Kali. Prices subject to change — see the live product pages.