★ SOSA reed diffusers · humidity
Damp air does almost nothing to the oil in the bottle and a great deal to the stick standing in it
★ ★ ★ ★ ★
★★★★★
"Two rattan diffusers died on me in successive monsoons before I understood the sticks were the problem, not the oil."
Switched to fibre reeds
★★★★★
"The reeds stayed clear and wicking right through the wettest fortnight we have had. My old ones used to look waterlogged by July."
Mountain Breeze 130ml
★★★★★
"I kept buying refills thinking the oil had failed. It was the reeds all along. Refreshing them cost nothing and fixed it."
Reed refresh · Garden Bloom
★★★★★
"A coastal flat is brutal on anything with natural pores. Fibre has been the first thing that behaves the same in January and August."
Fresh Brew 50ml
★★★★★
"The wet-line test settled an argument I had been having with myself for weeks. My reeds were wicking fine; the room was just sealed shut."
Airflow · humidity
★★★★★
"Told plainly that replacement reeds are not sold separately, and told what to do instead. I would rather have that than be sold something."
Morning Freshness 50ml
★★★★★
"Two rattan diffusers died on me in successive monsoons before I understood the sticks were the problem, not the oil."
Switched to fibre reeds
★★★★★
"The reeds stayed clear and wicking right through the wettest fortnight we have had. My old ones used to look waterlogged by July."
Mountain Breeze 130ml
★★★★★
"I kept buying refills thinking the oil had failed. It was the reeds all along. Refreshing them cost nothing and fixed it."
Reed refresh · Garden Bloom
★★★★★
"A coastal flat is brutal on anything with natural pores. Fibre has been the first thing that behaves the same in January and August."
Fresh Brew 50ml
★★★★★
"The wet-line test settled an argument I had been having with myself for weeks. My reeds were wicking fine; the room was just sealed shut."
Airflow · humidity
★★★★★
"Told plainly that replacement reeds are not sold separately, and told what to do instead. I would rather have that than be sold something."
Morning Freshness 50ml
✓ Six fibre reeds per bottle — fibre, not rattan, because rattan clogs in Indian humidity ✓ Tested through 85% monsoon humidity and 45°C summer heat · phthalate-free CCT base ✓ 50ml lasts 6–8 weeks · 130ml lasts 14–18 weeks · handmade in Pune
Founder Diaries · Reed Diffusers · Humidity
Why rattan suffers: rattan is a natural cane with irregular pores that absorb moisture, swell and then clog with residue. In a humid Indian home this frequently kills a diffuser within a fortnight, long before the oil is finished.
Why SOSA uses fibre: engineered fibre reeds have consistent channels that do not swell shut. Six of them come with every bottle, and the range is tested through 85% monsoon humidity as well as 45°C summer heat.
The counterintuitive part: humid air can make a bottle last longer while making the room read quieter — slower evaporation, plus a sealed damp house with no air movement to distribute what does leave.
Mountain Breeze₹849 · 9.4/10Rattan is a plant stem, and its pores were designed by nature to move water, not perfume oil. They vary in diameter along the stick, and the material takes up atmospheric moisture into its structure. In a humid room the reed swells a little, and a channel that was already irregular closes at its narrowest points first. Once a channel is partially closed, the heavier fragrance molecules that would ordinarily pass through it begin to accumulate instead, and the reed clogs from the inside. This is why an imported rattan diffuser so often smells wonderful for ten days in an Indian July and then simply stops, with three-quarters of the oil still in the bottle. The owner concludes the fragrance was weak. The fragrance is fine; the delivery system has closed.
Morning Freshness · cold and clearfrom ₹749Shop → 
Mountain Breeze · dry woodyfrom ₹849Shop → 
Fresh & Grounded duo₹1,548 / 2 × 50mlShop →
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.
It does, but almost never where people look for it. Humidity acts on the reed, not on the oil. The liquid in the bottle is a stable carrier holding perfume material; damp air does very little to it. The stick standing in that liquid, however, is a porous object whose entire job is to move fluid through tiny channels by capillary action — and porous objects in 85% relative humidity behave differently from porous objects in dry air. That single fact is why SOSA ships fibre reeds rather than rattan, and why so many imported diffusers quietly stop working in an Indian July.
Quick answers — read this first
Where humidity actually acts: on the reed's capillary channels. Water vapour competes for the pore space that oil needs to climb through. The oil in the bottle is largely unaffected.Why rattan suffers: rattan is a natural cane with irregular pores that absorb moisture, swell and then clog with residue. In a humid Indian home this frequently kills a diffuser within a fortnight, long before the oil is finished.
Why SOSA uses fibre: engineered fibre reeds have consistent channels that do not swell shut. Six of them come with every bottle, and the range is tested through 85% monsoon humidity as well as 45°C summer heat.
The counterintuitive part: humid air can make a bottle last longer while making the room read quieter — slower evaporation, plus a sealed damp house with no air movement to distribute what does leave.
The short answer
Short answer: yes, humidity affects reed diffuser performance, but it does so through the reeds rather than the fragrance. Damp reeds wick differently; damp rattan reeds swell and clog. If a diffuser has gone quiet in humid weather, lift a reed and look at it before you consider buying anything.
The mechanism: capillary action depends on open, consistently sized channels. Water vapour and moisture take up channel volume and change how readily oil climbs. Natural rattan cane absorbs that moisture into its structure and expands; engineered fibre does not, which is why every SOSA bottle ships with six fibre reeds and is tested through 85% humidity.
Shop: for damp air, cold and bright compositions cut through better than heavy sweet ones — Morning Freshness at ₹749 and Mountain Breeze at ₹849 for 50ml, or the two together as the Fresh & Grounded duo at ₹1,548. Free shipping above ₹499.
In this guide
Cuts through damp air
Morning Freshness · from ₹749
Dry woody, no sweetness
Mountain Breeze · from ₹849
Both, meeting on green
Fresh & Grounded duo · ₹1,548
Straight answer
Does humidity affect how well a reed diffuser works?
1. Yes — through the reeds, which is not where people look. The oil is a stable carrier and damp air does very little to it. The reed is a porous wick, and porosity is exactly what humidity interferes with. Before you replace anything, lift one reed out and look at where the wet part ends.
2. Rattan is the specific problem. Natural cane has irregular pores that take up atmospheric moisture, swell slightly, and then trap the heavier residue that every fragrance leaves behind. The result is a reed that looks full and delivers almost nothing. In a humid Indian home this can happen within a couple of weeks.
3. Fibre is the specific answer. Engineered fibre reeds have uniform channels that do not absorb moisture into the structure and do not swell shut. Every SOSA bottle ships with six of them, and the range is tested through 85% monsoon humidity as well as 45°C heat. This is not a styling choice; it is the reason the format works here at all.
4. Expect a longer bottle and a quieter room, together. Damp, still air slows evaporation, so the oil level falls more slowly. At the same time a humid house is usually a closed house with nothing moving the air, so less of what does leave reaches you. People read that combination as failure. It is not.
5. The free fixes are airflow and flipping, in that order. Get some gentle movement through the room — a slow ceiling fan across the room rather than over the bottle, a door left open, incidental traffic past a console. Then flip all six reeds with gloves on. Those two account for most humid-weather complaints.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. Rattan is the specific problem. Natural cane has irregular pores that take up atmospheric moisture, swell slightly, and then trap the heavier residue that every fragrance leaves behind. The result is a reed that looks full and delivers almost nothing. In a humid Indian home this can happen within a couple of weeks.
3. Fibre is the specific answer. Engineered fibre reeds have uniform channels that do not absorb moisture into the structure and do not swell shut. Every SOSA bottle ships with six of them, and the range is tested through 85% monsoon humidity as well as 45°C heat. This is not a styling choice; it is the reason the format works here at all.
4. Expect a longer bottle and a quieter room, together. Damp, still air slows evaporation, so the oil level falls more slowly. At the same time a humid house is usually a closed house with nothing moving the air, so less of what does leave reaches you. People read that combination as failure. It is not.
5. The free fixes are airflow and flipping, in that order. Get some gentle movement through the room — a slow ceiling fan across the room rather than over the bottle, a door left open, incidental traffic past a console. Then flip all six reeds with gloves on. Those two account for most humid-weather complaints.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: humidity works on the reed, not the oil. Rattan swells and clogs; fibre keeps wicking, which is why SOSA ships six fibre reeds per bottle and tests through 85% RH. In damp weather expect a slower bottle and a quieter room, and fix it with airflow and a flip before you spend anything.
Six fibre reeds, chosen for damp air
SOSA Morning Freshness · Malabar lemon, peppermint & Nilgiri eucalyptus ₹749 / 50ml
Cold, sharp compositions read more clearly in humid air than heavy sweet ones, which is why this is the bottle I reach for in a damp month. Malabar lemon over peppermint and Nilgiri eucalyptus, 9.0 on our internal strength scale at six reeds. Alcohol-free, phthalate-free and low-VOC on a heat-stable CCT base, tested through 85% humidity and 45°C heat, six fibre reeds in a refillable glass bottle. 130ml ₹1,249 for 14–18 weeks.
Part one — humidity acts on the reed, not on the oil
If you take one idea from this page, take this one: the humidity-sensitive component of a reed diffuser is the stick, not the liquid. People suspect the oil, because it is the part they paid for. But the carrier is a stable, non-water-miscible liquid; a damp room does not dilute it, spoil it or weaken it. The reed is a different proposition entirely. It is a porous solid whose whole function depends on channels of a particular size staying open and staying clear, and that is precisely the kind of structure that atmospheric moisture interferes with. Three consequences follow, and they explain most of what goes wrong in a coastal flat or a monsoon month.
1
THE MECHANISM
Water vapour competes for the space oil needs
Capillary action works because a narrow channel pulls liquid upward against gravity. The narrower and cleaner the channel, the better it pulls. In very damp air, moisture occupies part of that channel volume and sits on the pore walls, and the oil now has less clear path to climb through. The visible result is a wet-line that rises more slowly and sits lower than it does in dry weather — the reed looks less soaked than you expect, even though nothing is wrong with the bottle. On a fibre reed this is mild and self-correcting; on a natural cane reed it is the beginning of a much worse problem.
The rule: in damp weather, judge a reed by whether the wet-line is moving over days, not by how high it sits on any one afternoon.
2
WHY RATTAN FAILS HERE
A natural cane swells, then traps residue, then stops
Mountain Breeze₹849 · 9.4/10Rattan is a plant stem, and its pores were designed by nature to move water, not perfume oil. They vary in diameter along the stick, and the material takes up atmospheric moisture into its structure. In a humid room the reed swells a little, and a channel that was already irregular closes at its narrowest points first. Once a channel is partially closed, the heavier fragrance molecules that would ordinarily pass through it begin to accumulate instead, and the reed clogs from the inside. This is why an imported rattan diffuser so often smells wonderful for ten days in an Indian July and then simply stops, with three-quarters of the oil still in the bottle. The owner concludes the fragrance was weak. The fragrance is fine; the delivery system has closed.
The tell: plenty of oil left, reeds that look dark and full, and a room that smells of nothing. That is a clogged reed, and it is a humidity story.
3
WHY WE SHIP FIBRE
Consistent channels that damp air does not close
Every SOSA reed diffuser comes with six fibre reeds, and the choice is entirely about this problem. Fibre reeds are engineered rather than grown: the channels run the full length at a consistent diameter, the material does not absorb atmospheric moisture into its structure, and it does not swell shut. The whole reed range and every composition on it is tested through 85% monsoon humidity as well as 45°C summer heat, because a product designed for Indian homes has to survive both ends of the same year. I will be honest about the limit: fibre tolerates damp far better than rattan, but it is not magic. It tolerates a draught no better, and it still wants a flip once a week with gloves on.
Part two — rattan against fibre, part by part
This is the comparison that decided the specification of our bottles. It is set out by component rather than by brand, because the useful question is not which diffuser is better but which part of the system humid air is acting on. Note that in three of the six rows the oil is simply not involved.
Where damp air actually lands
The system, component by component, at high relative humidity
| Component | What high humidity does to it | Natural rattan reed | Engineered fibre reed | What you notice in the room |
|---|---|---|---|---|
| Capillary channel ★ | Moisture occupies pore volume, slowing the climb | Irregular pores narrow, then close at the tightest points | Uniform channels stay open; effect is mild and reversible | Rattan goes silent; fibre goes slightly quieter |
| Reed material itself | Cane takes moisture into its structure | Swells measurably; texture softens | Does not swell — moisture stays on the surface | A stick that feels different in July from January |
| Residue at the exposed end | Heavier molecules accumulate wherever flow slows | Clogs from the inside within weeks | Accumulates slowly; a weekly flip resets it | Dark tips with a room that smells of nothing |
| The oil in the bottle | Essentially nothing — the carrier is stable and not water-loving | Unaffected | Unaffected | Level falls more slowly than in dry heat |
| Evaporation off the reed | Saturated air accepts new vapour less readily | Slower, on top of an already blocked wick | Slower — the bottle genuinely lasts longer | Weeks gained, presence lost |
| The room's air | Damp houses are closed houses; little exchange | Nothing reaches you | Nothing reaches you either — this part is not the reed's fault | The commonest false verdict of the season |
| The honest caveat: fibre reeds solve the clogging problem, not every humidity problem. A sealed damp room with no air movement will read quiet whatever is standing in the bottle, and no reed material changes that — the answer there is gentle circulation, not a purchase. Humidity descriptions on this page are general climate framing for Indian homes rather than measurements of your room; the one hard figure we stand behind is that the range is tested through 85% relative humidity. | ||||
Shop this guide
What I would run through a damp stretch
Morning Freshness · cold and clearfrom ₹749Shop → Mountain Breeze · dry woodyfrom ₹849Shop → Fresh & Grounded duo₹1,548 / 2 × 50mlShop →
The SOSA principle
We did not choose fibre because it looks modern. We chose it because rattan does not survive an Indian July.
The reed is the part of a diffuser that fails in a damp climate. Specifying it correctly is a bigger decision than any note in the composition.
Part three — the wet-line test, read for damp weather
The diagnostic I give people all year takes ten seconds, and in humid weather it is the only thing that separates a clogged reed from a quiet room. Lift one reed straight out with gloves on and find the boundary between the darkened, oil-soaked section and the dry section above it. That boundary is the wet-line, and its position tells you which of three completely different things is happening. High and very dark, with the reed feeling heavy: the reed is saturated and delivery has stalled — flip all six. Barely above the oil after several days: the reed is not wicking — in a rattan bottle very likely swelling and clogging, in a fibre one usually reeds that are simply old. Somewhere sensibly in the middle, moving over days, while the room still smells of nothing: your reeds are fine and your problem is air.
That third case is the one I want to slow down on, because it is the most common and the most misdiagnosed. A humid house in India is typically a closed house. Windows shut against the rain, doors closed to keep a cooled room cool, curtains drawn, nothing moving. A reed diffuser is a passive point source with no propulsion whatsoever — it releases fragrance and then waits for the room to carry it. In genuinely still air, that release pools within a foot or so of the glass and never travels. The correct answer is gentle, incidental movement: a slow ceiling fan running across the room rather than directly over the bottle, an internal door left open so air can exchange between spaces, and the bottle placed where people actually pass — a console near a doorway, waist to chest height, with clear space around it.
A last practical note on damp-weather housekeeping. Reeds are the consumable in this system and the oil is the stable part, which is the reverse of how nearly everyone treats them. People buy a refill and keep the same tired reeds, when the reeds are the component that has been working hardest through a humid season. Our guidance is to refresh reeds every few months, and I will state the gap honestly: we do not currently sell replacement reeds as a separate item, so a fresh set arrives with a new bottle. Flip weekly with gloves, stand the bottle on a tray because the oil marks wood and stone, and keep it out of reach of children and pets.
Damp air does not spoil your fragrance. It closes the road the fragrance travels on.
— Sonal Sahani, SOSA
Part four — the humid-weather edit
Arranged by what is happening rather than by what to buy, because in damp weather the majority of the answers are free and the paid ones are mostly about the composition reading better, not working better.
The humidity edit
Symptom, real cause, and the correct response
| Symptom in damp weather | What it actually is | Do this | Do not do this |
|---|---|---|---|
| Oil barely dropping, room silent ★ | Reeds clogged, or air completely still | Wet-line test, then flip all six; open an internal door | Buy a stronger scent before you have looked at a reed |
| Reeds look dark and swollen | Rattan taking up moisture and closing its pores | Move to fibre reeds — every SOSA bottle ships with six | Trim, wash or soak the old reeds; it does not reopen them |
| Wet-line sitting low and not rising | Wicking has slowed or the reeds are spent | Refresh reeds; SOSA guidance is every few months | Assume the oil has failed and buy a refill first |
| Bottle lasting longer than the stated window | Slower evaporation in saturated air — entirely normal | Enjoy it, or add a reed if you want more presence | Read it as the fragrance having "stopped working" |
| Sweet scent feels oppressive in a closed damp room | Composition choice, not performance | Switch to Morning Freshness ₹749 or Mountain Breeze ₹849 | Add reeds to a scent that is already too much |
| Two rooms, one damp and sealed, one open | Output per bottle is fixed; you need another source | Two 50ml, or the Fresh & Grounded duo at ₹1,548 | Buy one 130ml expecting it to cover both |
| Want scent on demand when the house is shut up | The honest limit of a passive format | Sukoon at ₹1,899, 270–320 sq ft, timers, three scents in the box | Put reed oil in it — the two lines are not interchangeable |
Honest notes for buyers: the humidity testing we cite is SOSA's own, through 85% relative humidity and 45°C heat; it describes the formulation and the reeds, not a promise about any particular room. Replacement reeds are not sold as a separate item — an honest gap — and refills are oil only, so you reuse your own vessel and reeds; guidance is to refresh reeds every few months. Strength figures are positions on SOSA's internal scale at six reeds, not an industry standard and not a concentration. A 130ml lasts 14–18 weeks against 6–8 for a 50ml at the same six reeds; it is a longer bottle, not a louder one. Reed oil never goes into a Sukoon or Boond, and the water-based Hotel Collection never goes into a reed bottle. Stand the bottle on a tray, and keep it away from children and pets.
Two sources beat one in a closed house
SOSA Fresh & Grounded duo · Morning Freshness + Mountain Breeze ₹1,548 / 2 × 50ml
When the windows are shut for weeks, the limiting factor is not the fragrance — it is that a single point source cannot reach across a divided flat with no air moving through it. Two bottles at opposite ends beat one in the middle, and these two share a green eucalyptus thread so they meet rather than clash where the spaces overlap. Both cold rather than sweet, which is what damp air flatters. 2 × 130ml ₹2,548 if you want 14–18 weeks apiece.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
The reed specification was the least glamorous decision we made and probably the most important. Rattan looks lovely — it photographs like something you would want on a console, and it costs less. It also fails in this country, and it fails in a way that makes the customer blame the fragrance rather than the stick.
I watched it happen with imported diffusers in my own home before SOSA existed. Beautiful for a fortnight, then nothing, with two-thirds of the bottle still full. It took me too long to work out that the perfume was intact and the wick had closed. Once you have seen it, you cannot ship it.
So every bottle we make goes out with six fibre reeds, and the whole range is tested through 85% monsoon humidity as well as 45°C heat. If there is one thing I would like the category to be more honest about in India, it is that the reed is a consumable and the oil is the stable part — most people have it exactly the wrong way round. Everything is composed and handmade in small batches in Pune, and a part of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
Does humidity make a reed diffuser weaker?
It usually makes the room read quieter, for two reasons that are easy to confuse. Saturated air accepts new vapour less readily, so evaporation slows — and damp weather means closed houses with almost no air movement. Gentle circulation fixes far more of that than a stronger scent will.
Why do rattan reed diffusers stop working in the monsoon?
Rattan is a natural cane with irregular pores that take up atmospheric moisture. The material swells slightly, the narrowest points in each channel close, and heavier fragrance molecules accumulate and block them from the inside. The bottle stays full and the room goes silent. Fibre reeds do not swell shut.
Does damp weather spoil reed diffuser oil?
No. The carrier is a stable, non-water-loving liquid and sitting in a humid room does not dilute or degrade it. Our compositions sit on a coconut-derived CCT base tested through 85% monsoon humidity and 45°C heat. If a diffuser has gone quiet in damp weather, look at the reeds and the airflow — the oil is almost never the culprit.
Should I use more reeds in humid weather?
You can, and unlike hot weather it is a reasonable move — evaporation is slower, so an extra reed or two buys presence without the usual cost in weeks being as steep. Six is the count each SOSA composition is dosed for, so treat seven or eight as a temporary adjustment, and flip all of them weekly. Do it after you have tried airflow, not before.
Can I dry my reeds out or wash them?
No — drying, washing or trimming a clogged reed does not reopen the channels, because what blocks them is accumulated heavier fragrance material, not water alone. Flipping all six with gloves on is the genuine reset. If flipping no longer restores delivery, the reeds are spent; guidance is to refresh them every few months, and a new set of six comes with every bottle.
Reed diffusers & humidity · 2027
The reed is the part damp air attacks. So we specified the reed first
Six fibre reeds in every SOSA bottle — fibre rather than rattan because rattan's pores clog in Indian humidity — on an alcohol-free, phthalate-free, low-VOC coconut-derived CCT base tested through 85% monsoon humidity and 45°C summer heat. From ₹749 for 50ml (6–8 weeks) and ₹1,249 for 130ml (14–18 weeks). Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
Shop fibre-reed diffusers → Fresh & Grounded duo ₹1,548
Continue the read
More on weather and reed diffusers
- How does the Indian monsoon affect reed diffusers? — 85% RH and the closed house.
- Better performance in humid weather — why cold compositions read better in damp air.
- Does hot weather affect reed diffusers? and why can't I smell my reed diffuser?
- The complete weather and climate guide — the whole sub-cluster in one place.
- 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 how atmospheric humidity acts on reed diffuser performance. The 85% relative humidity and 45°C figures refer to SOSA's own in-house testing of its compositions and fibre reeds. Descriptions of rattan swelling and clogging, and of how damp air slows evaporation, are material behaviour and general climate framing for Indian homes rather than measurements taken in any specific room or city; we give no percentage for how much humidity slows a bottle, because that is not a figure we can honestly quote. Bottle-life windows (6–8 weeks for 50ml, 14–18 weeks for 130ml at six reeds) and the guidance to refresh reeds every few months are SOSA working guidance from in-house testing and customer correspondence, not laboratory measurements. 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.