★ SOSA reed diffusers · after the flip
The hour after a flip is not the new normal — the quiet, steady week that follows it is
★ ★ ★ ★ ★
★★★★★
"The first hour after flipping is lovely and then it calms down. I used to think that meant it had failed again."
Garden Bloom 50ml
★★★★★
"Knowing there is a short surge and then a settle stopped me from flipping twice in one day out of panic."
Fresh Brew 130ml
★★★★★
"I flipped an hour before people arrived and the hall smelled exactly right when the door opened. That timing tip was gold."
Entryway · hosting
★★★★★
"Ten minutes after flipping I got a whiff of something sharper. Apparently that is the fresh surface waking up."
Mountain Breeze 50ml
★★★★★
"Nothing at all happened when I flipped, which told me the reeds were finished rather than the oil. Useful diagnosis."
Reeds past their life
★★★★★
"Oil ran down the glass the first time because I turned them over too quickly. Resting them on the neck fixed it."
Evening Calm 130ml
★★★★★
"The first hour after flipping is lovely and then it calms down. I used to think that meant it had failed again."
Garden Bloom 50ml
★★★★★
"Knowing there is a short surge and then a settle stopped me from flipping twice in one day out of panic."
Fresh Brew 130ml
★★★★★
"I flipped an hour before people arrived and the hall smelled exactly right when the door opened. That timing tip was gold."
Entryway · hosting
★★★★★
"Ten minutes after flipping I got a whiff of something sharper. Apparently that is the fresh surface waking up."
Mountain Breeze 50ml
★★★★★
"Nothing at all happened when I flipped, which told me the reeds were finished rather than the oil. Useful diagnosis."
Reeds past their life
★★★★★
"Oil ran down the glass the first time because I turned them over too quickly. Resting them on the neck fixed it."
Evening Calm 130ml
✓ Six fibre reeds per bottle · flip weekly with gloves ✓ A days 1–3 spike, a weeks 1–2 settle, then the plateau that holds ✓ Alcohol-free, phthalate-free, low-VOC · handmade in Pune
Founder Diaries · Reed Diffusers · After the Flip
First hour: the surge proper. The room reads noticeably fuller and slightly brighter than it did yesterday.
That evening: the settle. Output drops back to a steady level — this is the plateau, and it is the product.
The mistake: judging the flip against the surge instead of against last week. Flip about an hour before you want a room at its best.
Fresh Brew₹849 · 9.5/10Once the surplus has gone, the reed settles into the only rate it can sustain: the speed at which oil climbs the fibre by capillary action, minus whatever the air is carrying away. A visible wet line establishes itself a little way above the oil and stays roughly there. This equilibrium is what the composition was dosed against — when I set a fragrance at six reeds, this steady state is the level I am tuning, not the first hour. In a warm room the boundary sits higher and the rate is faster; in a cold January room it sits lower and the rate is slower. Either way it is stable within a few hours, and the room you smell that evening is a fair sample of the week ahead.
Garden Bloom · 8.9/10from ₹799Shop → 
Fresh Brew · 9.5/10from ₹849Shop → 
Sukoon · scent on demand₹1,899Shop →
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.
Something quite specific happens in the hours after you turn six reeds over, and almost nobody describes it accurately, which is why so many people misread it. There is a short lift, a settle, and then a level that holds for days. The lift is not the new baseline and was never meant to be — it is a saturated surface meeting dry air for the first time, and it is a transient. The level it settles to is the fragrance you actually bought. Understanding the shape of that curve tells you when to flip before guests arrive, how to judge whether a flip worked, and why flipping again the same evening achieves nothing at all.
Quick answers — read this first
First ten minutes: a small, sharp lift near the bottle as freshly wetted fibre meets the air. Barely a room-wide effect yet.First hour: the surge proper. The room reads noticeably fuller and slightly brighter than it did yesterday.
That evening: the settle. Output drops back to a steady level — this is the plateau, and it is the product.
The mistake: judging the flip against the surge instead of against last week. Flip about an hour before you want a room at its best.
The short answer
Short answer: turning the reeds over exposes fibre that has been sitting under the oil — fully saturated, carrying the composition in its correct proportions, and never yet evaporated from. That surface releases quickly for the first hour or so, then settles into a steady rate as a new evaporation boundary establishes itself. By the following morning the bottle is running at the level it was designed for, and it will hold roughly there until the next flip.
The mechanism: the surge is surplus. A freshly submerged reed end carries more oil than the exposed surface can hold at equilibrium, so the excess leaves fast. What follows is the balance point between how quickly oil climbs the fibre and how quickly the room takes it away — which is the same plateau logic that governs the whole bottle: a days-1–3 spike when it is new, a weeks-1–2 settle, then a level that holds to the end.
Shop: if you flip before guests, flip an entryway bottle — Garden Bloom at ₹799 for 50ml is built for exactly that job, with British rose over night-blooming jasmine at 8.9 on SOSA's own internal scale. If what you actually want is scent on demand rather than a steady background, that is a Sukoon at ₹1,899, not a reed. Free shipping above ₹499.
In this guide
Best in a hall before guests
Garden Bloom 8.9 · from ₹799
Biggest post-flip lift
Fresh Brew 9.5 · from ₹849
If you want scent on demand
Sukoon · ₹1,899
Straight answer
What actually happens after you flip reed diffuser sticks?
1. Immediately — a wet surface meets dry air. The end that was submerged is fully loaded and has never evaporated from. Within a minute or two there is a noticeable sharpness at close range, strongest if you are standing over the bottle.
2. Ten to thirty minutes — the top notes report first. Whatever is lightest in the composition leaves first, so the room briefly reads brighter and cleaner than its usual character. A Fresh Brew smells more of coffee and less of vanilla for a while.
3. One to three hours — the surge. The whole room is fuller. This is the phase people notice, and it is the phase they mistakenly treat as the standard against which everything afterwards looks like failure.
4. That evening — the settle. Surplus oil has gone, a new evaporation boundary has formed a little way down the reed, and output drops to the rate at which oil can climb. Lower than the surge; higher than yesterday.
5. Next morning to day three — the plateau. Steady, consistent, and the level at which the composition was designed to sit at six reeds. This is the product. It is deliberately low, because a reed diffuser is a constant passive background rather than an event.
6. Days four to seven — the slow drift back. The gradient begins reforming, the exposed surface gradually loads with heavier material, and by the end of the week you are ready to do it again.
7. If nothing at all happens — no lift, no change by evening — the flip is not at fault. Either the reeds have reached the end of their working life, or the room's air is not moving at all, or your nose has adapted to a constant it stopped reporting days ago.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. Ten to thirty minutes — the top notes report first. Whatever is lightest in the composition leaves first, so the room briefly reads brighter and cleaner than its usual character. A Fresh Brew smells more of coffee and less of vanilla for a while.
3. One to three hours — the surge. The whole room is fuller. This is the phase people notice, and it is the phase they mistakenly treat as the standard against which everything afterwards looks like failure.
4. That evening — the settle. Surplus oil has gone, a new evaporation boundary has formed a little way down the reed, and output drops to the rate at which oil can climb. Lower than the surge; higher than yesterday.
5. Next morning to day three — the plateau. Steady, consistent, and the level at which the composition was designed to sit at six reeds. This is the product. It is deliberately low, because a reed diffuser is a constant passive background rather than an event.
6. Days four to seven — the slow drift back. The gradient begins reforming, the exposed surface gradually loads with heavier material, and by the end of the week you are ready to do it again.
7. If nothing at all happens — no lift, no change by evening — the flip is not at fault. Either the reeds have reached the end of their working life, or the room's air is not moving at all, or your nose has adapted to a constant it stopped reporting days ago.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: a sharp close-range lift within minutes, a full-room surge for one to three hours, a settle by evening, then a steady plateau for several days before the gradient reforms. Flip about an hour before you want a room at its best, and judge the result against last week rather than against the surge.
The bottle worth flipping before the doorbell
SOSA Garden Bloom · British rose & night-blooming jasmine ₹799 / 50ml
An entryway is the one place in a home where the post-flip hour has an audience, because it is the room people meet first and stay in briefly. Garden Bloom is composed for that job: rounded, hotel-like, presence without insistence, at 8.9 on SOSA's own internal strength scale at six reeds. Flip it an hour before guests and the hall is at its fullest exactly when the door opens. Alcohol-free and phthalate-free on a heat-stable CCT base. 130ml ₹1,299 for 14–18 weeks.
Part one — the three things a single flip sets in motion
Turning a reed over looks like one action and is in fact three, running on three different clocks. Separating them explains almost every question I get about what to expect afterwards — including why the effect arrives faster than people assume and lasts less long than they hope.
1
CLOCK ONE · MINUTES
Surplus oil leaving a surface that cannot hold it
The submerged end of a reed is carrying more oil than an exposed surface can retain once it is standing in air. That surplus is the entire source of the surge. It leaves quickly — most of it within the first hour or two — and it leaves in volatility order, which is why the room briefly reads brighter and sharper than the fragrance's settled character. Nothing about this phase tells you how the bottle will perform tomorrow. It is the equivalent of the days-one-to-three spike you get from a brand-new bottle, when dry reeds are absorbing and releasing at once and the top notes are still present in bulk. Both are transients. Both are lovely. Neither is the thing you are buying.
The timing rule: flip about an hour before you want the room at its best, not as the doorbell goes.
2
CLOCK TWO · HOURS
A new evaporation boundary finds its level
Fresh Brew₹849 · 9.5/10Once the surplus has gone, the reed settles into the only rate it can sustain: the speed at which oil climbs the fibre by capillary action, minus whatever the air is carrying away. A visible wet line establishes itself a little way above the oil and stays roughly there. This equilibrium is what the composition was dosed against — when I set a fragrance at six reeds, this steady state is the level I am tuning, not the first hour. In a warm room the boundary sits higher and the rate is faster; in a cold January room it sits lower and the rate is slower. Either way it is stable within a few hours, and the room you smell that evening is a fair sample of the week ahead.
The judgement rule: assess a flip the following morning, against how the room read last week — not against the surge.
3
CLOCK THREE · DAYS
Your nose stops reporting it — but the bottle has not stopped
The third clock is not in the bottle at all. Olfactory adaptation is the commonest reason people believe a diffuser has stopped working, and it operates hardest on constants in your own home, where the fragrance carries no novelty and no threat. Within a few days of a flip, most people stop registering a background that a visitor notices from the doorway. This is why the surge is so seductive: it is a change, and change is precisely what a nose is built to detect. The free test is fifteen minutes outside — a walk to the gate and back, or simply another room with the door shut — and then a deliberate return through the doorway. If the room greets you, the diffuser is fine and your nose was the variable.
Part two — the aftermath, hour by hour
This is the curve as customers describe it and as I have watched it in my own hall, on a 50ml at six reeds in an ordinary room with the bottle near a doorway. Times shift with heat: a 40°C afternoon compresses everything below and a cold room stretches it.
The post-flip timeline
What is happening on the reed, and what the room smells like
| Time after the flip | On the reed | In the room | What to do |
|---|---|---|---|
| 0–10 minutes ★ | Saturated fibre meets dry air; surplus oil begins leaving | Sharp and clear at close range; little effect beyond a metre | Wipe the neck and the tray, then leave it alone |
| 10–60 minutes | The lightest material departs first, in volatility order | Brighter and cleaner than the fragrance's usual character | Open an interior door so the room can distribute it |
| 1–3 hours | Surplus largely gone; the wet line begins forming | The surge — fullest the room will be all week | This is the window to have guests arrive |
| That evening | Evaporation and capillary climb reach balance | The settle: quieter than the surge, fuller than yesterday | Judge nothing yet; your nose has been in it all day |
| Next morning | Stable boundary, steady rate, correct proportions | The plateau — this is the honest level of the bottle | Walk in from outside and take one reading. That is your answer |
| Days 2–4 | Holding steady; the gradient has barely begun to reform | Consistent, and increasingly invisible to you specifically | Trust guests over your own nose |
| Days 5–7 | Heavy material accumulating at the exposed end again | Slightly flatter, warmer, more base-heavy by the weekend | Flip again. All six, gloves on |
| The honest caveat: the surge is not repeatable on demand. Flipping again in the same evening does almost nothing, because there is no surplus left to release — you will get a faint lift, a little oil on the tray and a marginally shorter bottle. If what you want is a room that can be made strong at will, before guests or after cooking, that is genuinely a different product: a Sukoon at ₹1,899 covers 270–320 sq ft with timers and switches on. Reeds cannot surge to order. That is their design, not their failing. | |||
Shop this guide
A steady background, and the thing that is not one
Garden Bloom · 8.9/10from ₹799Shop → Fresh Brew · 9.5/10from ₹849Shop → Sukoon · scent on demand₹1,899Shop →
The SOSA principle
The hour after a flip is the advertisement. The week after it is the product.
Every reed diffuser has a spike and a plateau. Brands that sell you the spike are selling you three days of a six-week purchase.
Part three — why the settle is the point, and the surge is not
There is an entire category of reed diffuser built to maximise the first hour. The method is not secret: raise the volatile fraction and use a solvent that pushes fragrance off the fibre hard. Phthalate carriers do this very well. You get a spectacular week one, a thinning week three, and by about week six — particularly in Indian heat — a composition that has degraded into something faintly acrid. SOSA is phthalate-free on a heat-stable coconut-derived CCT base, and I will state the trade rather than hide it: a smaller opening, a flatter and longer plateau. Our bottles do not win the first hour against that kind of product. They are still doing the same job in week six, at 45°C, which is the part I care about and the part you paid for.
This is also why I would gently push back on the instinct to chase the surge. Flipping twice a day, adding reeds on a Wednesday because Monday's flip has faded, buying a second bottle within a fortnight — these are all responses to a curve that was never going to stay at its peak. What a reed diffuser gives you is a constant, passive, deliberately low background: no fan, no heat, no switch. Almost every complaint I receive is a collision between that design and an expectation borrowed from a spray or a plug-in. Once you accept the plateau as the deliverable, the flip becomes what it should be — routine maintenance that keeps a steady thing steady, rather than a lever you keep pulling in hope.
And when you genuinely want a surge, buy a surge. If the requirement is a hall that can be made fragrant twenty minutes before people arrive, or a kitchen reset after cooking — extractor on, window open ten minutes, close up, wait half an hour, and only then scent the room — then a machine is the honest tool. A Sukoon at ₹1,899 covers 270–320 sq ft, runs 16–18 hours on low, has a remote and steady, two-hour and four-hour timers, and comes with three 15ml Hotel Collection fragrances in the box. It runs water-based Hotel Collection oil and never reed oil; reed oil never goes into a machine, and Hotel Collection never goes into a reed bottle. Most homes end up running both formats, because a background and an event are different requirements and no single product does both well.
A flip is not a switch you press for more. It is a reset that returns a steady thing to steady.
— Sonal Sahani, SOSA
Part four — reading your own flip
The most useful thing about the post-flip window is diagnostic. What happens in those first hours tells you which of the common problems you actually have, and it costs nothing to run. Flip on a morning when you can leave the house for a while, and read the result against this table.
The post-flip diagnostic
What you observed, what it means, what to do next
| What you observed | What it means | Your next move | Cost |
|---|---|---|---|
| A clear surge, then a settle to a decent level ★ | Everything is working exactly as designed | Keep the weekly cadence and change nothing | Free |
| A big surge, then almost nothing by evening | The room is not carrying it — dead air, or a draught stripping it | Move to a console near a doorway, waist to chest height, clear of AC and sun | Free |
| No surge at all, reeds look dark and dry above the oil | The reeds are at the end of their working life, not the oil | Refresh the reeds; then refill the vessel rather than rebuying | Refill ₹2,399 |
| No surge, wet line barely above the oil | Not wicking — thick cold oil, or crowded reeds in the neck | Fan the reeds out; add one or two; check the room is not under 20°C | Free |
| A surge you can smell only when standing over it | Placement, almost certainly — a point source with nothing to carry it | Raise it and move it into gentle passing traffic | Free |
| Guests notice it; you do not | Olfactory adaptation. Your nose stopped reporting a constant | Believe the guests. Fifteen minutes outside and walk back in | Free |
| Everything correct, room still too quiet for the space | Beyond roughly 250–300 sq ft of connected volume, reeds are the wrong tool | Two bottles at opposite ends, or a Sukoon | From ₹1,498 · Sukoon ₹1,899 |
Honest notes for buyers: the timings on this page are SOSA's working guidance from in-house observation and customer correspondence, not laboratory measurements — heat compresses the curve and cold stretches it. Strength figures are positions on SOSA's own internal scale at six reeds, not an industry standard or a concentration. Our reed compositions are alcohol-free, phthalate-free, paraben-free, low-VOC and IFRA-compliant on a heat-stable coconut-derived CCT carrier, tested through 45°C summers and 85% monsoon humidity. Refills are oil only — you reuse your own vessel and reeds — 300ml ₹2,399 for roughly 8–11 months and 500ml ₹3,499 for 14–18 months; reeds are not sold separately, which is an honest gap, and we suggest refreshing them every few months. A 130ml lasts 14–18 weeks against 6–8, which is duration rather than volume. Reed oil never goes into a Sukoon, Boond or Megh. Stand the bottle on a tray, keep it out of direct sunlight, and keep everything away from children and pets. Handmade in small batches in Pune; a portion of every order supports girl-child education through Nanhi Kali.
Where the settle matters more than the surge
SOSA Evening Calm · Kashmir lavender & chamomile ₹799 / 50ml
A bedroom is the one room where you should want the plateau and not the peak. Evening Calm sits at 8.9 on our internal scale and is the softest composition we make, deliberately — it is built to help you sleep rather than to announce itself, and a surge in a bedroom at eleven at night is a nuisance rather than a pleasure. Flip it in the morning so the lift has settled by bedtime. Four reeds instead of six makes it gentler still and takes the bottle comfortably past eight weeks. 130ml ₹1,299.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
The post-flip hour is the most flattering hour a reed diffuser has, and for a while I was tempted to build the marketing around it. Photograph the bottle, describe the surge, let people find out about the plateau on their own. Every brand in this category faces that temptation and a great many give in to it.
I decided against it for a simple reason: the surge lasts an hour and the bottle lasts six to eight weeks. If I sell you the hour, I have described about one per cent of what you are buying, and you will spend the other ninety-nine feeling mildly cheated. So we publish the curve — a spike, a settle, a plateau — and I would rather someone chose a machine because a reed was honestly described than bought a reed on the strength of an hour.
The version of this I like best is small and domestic. Flip the hall bottle on a Sunday morning while the coffee is brewing. By the time anyone arrives in the afternoon it has settled into something warm and unremarkable, and nobody says anything about the fragrance at all — which is precisely the result. Handmade in small batches in Pune, and a part of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
What happens when you flip reed diffuser sticks?
A saturated end that has been sitting under the oil is exposed to air for the first time. Surplus oil leaves quickly, producing a noticeable lift over the first one to three hours; then evaporation and capillary climb reach balance and the bottle settles to a steady rate by that evening. From the next morning it holds a consistent plateau until the residue gradient reforms towards the end of the week.
How long does it take for a flip to work?
You will notice something within ten minutes at close range and across the room within an hour. The reliable, settled result is there by the following morning. Judge the flip then, ideally by walking in from outside, rather than by standing next to the bottle during the surge.
Why does my diffuser smell strong for an hour and then fade again?
That is the curve behaving normally — the surge is surplus oil leaving a freshly wetted surface, and it was never the baseline. If the settle is much lower than you would expect, the likelier cause is the room rather than the bottle: dead air with nothing to distribute the fragrance, or a draught from an AC or fan stripping the reeds and emptying the bottle weeks early.
Nothing happened when I flipped. Is the diffuser faulty?
Almost never. Three likelier explanations: the reeds have reached the end of their working life and can no longer redistribute the heavy residue they have absorbed; the bottle is somewhere the air does not move; or you have adapted to the fragrance and stopped registering it. Test the last one first, because it is free — fifteen minutes out of the house, then walk back in through the door.
Can I flip twice in an evening to get the surge back?
You can, but there is very little left to release, so the second flip does almost nothing beyond putting oil on your tray and shortening the bottle slightly. If you want a room that can be made strong on demand, that is an ultrasonic machine rather than a reed — a Sukoon at ₹1,899 with timers and three fragrances in the box. Note that it takes water-based Hotel Collection oil, never reed oil.
After the flip · 2027
An hour of surge, then the plateau you actually bought — flip an hour before it matters
Garden Bloom and Evening Calm from ₹799, Morning Freshness from ₹749, Fresh Brew and Mountain Breeze from ₹849, six fibre reeds in every bottle; 50ml lasts 6–8 weeks and 130ml 14–18. If what you want is scent on demand rather than a background, the Sukoon at ₹1,899 covers 270–320 sq ft with timers. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
Shop the reed range → Sukoon ₹1,899
Continue the read
More on flipping reeds
- Should you flip reed diffuser sticks? — the residue gradient the flip exists to reverse.
- How often to flip and all the reeds or only some? — smoothing the surge out.
- Does flipping make it stronger? — where the ceiling sits, and how to find yours for free.
- The complete reed-flipping guide, and why can't I smell my reed diffuser?
- 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 what happens in the minutes, hours and days after reed diffuser sticks are turned over. The post-flip timeline described here is SOSA's own working observation from in-house testing and customer correspondence, not a laboratory measurement; timings compress in heat and stretch in cold, and vary with composition, reed age and room ventilation. 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.