★ SOSA reed diffusers · is it working
You are the one person in the house who cannot answer this question. Here are three witnesses who can
★ ★ ★ ★ ★
★★★★★
"Held a reed an inch from my nose and it was loud. That single test told me the bottle was fine and my nose was not."
Mountain Breeze 50ml
★★★★★
"My mother visited after a month away and said the whole flat smelled of coffee. I had genuinely stopped noticing it weeks earlier."
Fresh Brew 130ml
★★★★★
"The wet line on my reeds was sitting a centimetre above the oil. Added three reeds and it climbed properly within two days."
Wet-line test
★★★★★
"Fifteen minutes out on the balcony, then walked back in. That is the only honest test I have found and it costs nothing."
Doorway test
★★★★★
"I had been judging the bottle by the oil level for six weeks. Wrong instrument entirely — the reeds were the thing to read."
Evening Calm 50ml
★★★★★
"Ran all three tests in about a minute. Two passed, one failed, and the failure pointed straight at where the bottle was standing."
Garden Bloom · placement
★★★★★
"Held a reed an inch from my nose and it was loud. That single test told me the bottle was fine and my nose was not."
Mountain Breeze 50ml
★★★★★
"My mother visited after a month away and said the whole flat smelled of coffee. I had genuinely stopped noticing it weeks earlier."
Fresh Brew 130ml
★★★★★
"The wet line on my reeds was sitting a centimetre above the oil. Added three reeds and it climbed properly within two days."
Wet-line test
★★★★★
"Fifteen minutes out on the balcony, then walked back in. That is the only honest test I have found and it costs nothing."
Doorway test
★★★★★
"I had been judging the bottle by the oil level for six weeks. Wrong instrument entirely — the reeds were the thing to read."
Evening Calm 50ml
★★★★★
"Ran all three tests in about a minute. Two passed, one failed, and the failure pointed straight at where the bottle was standing."
Garden Bloom · placement
✓ Six fibre reeds per bottle · alcohol-free, phthalate-free CCT base · handmade in Pune ✓ 50ml lasts 6–8 weeks · 130ml lasts 14–18 weeks · oil refill 300ml ₹2,399 ✓ A portion of every order supports girl-child education through Nanhi Kali
Founder Diaries · Reed Diffusers · Diagnostics
Test two · the held reed: hold that reed an inch from your nose. Strong here means the bottle is delivering and the problem is distribution or adaptation, not supply.
Test three · the returning visitor: fifteen minutes out of the house, then walk back in through the front door. Or simply ask someone who has just arrived.
The test that is not a test: the oil level. It moves a few millimetres a week and tells you almost nothing before week four.
Garden Bloom₹799 · 8.9/10Still holding the same reed, bring it to about an inch from your nose and breathe normally rather than sniffing hard. This matters more than it sounds: the reed is the emitting surface, and the bottle neck is not. Vapour pools in the neck of any diffuser, so a neck sniff will smell wonderful on a bottle that has completely stopped delivering — it is the single most misleading check people run. A held reed that is unmistakably strong tells you the composition is intact, the oil has not degraded, and the surface is releasing. Note also that adaptation barely affects this reading, because you have only just introduced the smell at close range. If the held reed is strong and your room is silent, you have proved the fault lies in the room rather than the bottle, and you have done it in ten seconds.
Fresh Brew · 9.5/10from ₹849Shop → 
Fresh & Grounded duo · two sources₹1,548Shop → 
Sukoon · when you want it 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.
There is an awkward fact at the centre of this question. The person best placed to notice a reed diffuser is the one person in the house who is structurally incapable of judging it. Your nose stops reporting a constant within minutes, and it adapts hardest in the place you spend most of your time. So "I can't smell it, therefore it isn't working" is not a diagnosis — it is the expected output of a healthy nose in its own home. What follows are three tests that route around that problem entirely. Each takes under a minute, none of them costs anything, and between them they will tell you whether the bottle, the room or your own adaptation is the thing at fault.
Quick answers — read this first
Test one · the wet line: lift one reed and find the boundary between oil-soaked and dry. It should sit clearly above the oil and be climbing.Test two · the held reed: hold that reed an inch from your nose. Strong here means the bottle is delivering and the problem is distribution or adaptation, not supply.
Test three · the returning visitor: fifteen minutes out of the house, then walk back in through the front door. Or simply ask someone who has just arrived.
The test that is not a test: the oil level. It moves a few millimetres a week and tells you almost nothing before week four.
The short answer
Short answer: run three checks in this order — the wet line on a lifted reed, the smell of that reed held an inch from your nose, and the reaction of somebody entering the house from outside. A working bottle passes all three. Which one it fails tells you exactly what kind of problem you have: a supply problem at the reed, a distribution problem in the room, or no problem at all beyond your own olfactory adaptation.
The mechanism: oil climbs six fibre reeds by capillary action and evaporates from the exposed length, and the room then has to carry it to you. Those are two separate stages, and they fail in different ways. The held reed isolates stage one; the returning-visitor test measures stage two. Judging both at once, from your armchair, with an adapted nose, tells you nothing about either.
Shop: Mountain Breeze at 9.4 and Fresh Brew at 9.5 from ₹849; Garden Bloom and Evening Calm from ₹799; Morning Freshness from ₹749. Strength figures are positions on SOSA's own internal scale at six reeds. Free shipping above ₹499.
In this guide
Easiest to read on a held reed
Mountain Breeze 9.4 · from ₹849
Hardest to miss on the doorway test
Fresh Brew 9.5 · from ₹849
If you want scent on demand
Sukoon · ₹1,899
Straight answer
How can I tell whether my reed diffuser is actually working?
1. Read the wet line before anything else. Lift one reed out with gloves on and look for the boundary between the darker, oil-soaked section and the dry section above it. On a healthy bottle at week three that line sits clearly above the oil, and the reed feels damp along most of its buried length. This is the only direct evidence you have that the supply chain from bottle to air is intact.
2. Then hold that reed an inch from your nose. Do not sniff the bottle neck — the neck always smells, because vapour pools there. The reed is the emitting surface, and it is what the room is actually being offered. If the held reed is strong, the bottle is fine and your problem is downstream of it. If the held reed is faint, you have a genuine supply problem and the fix is a flip or more reeds.
3. Then leave the house for fifteen minutes. Balcony, stairwell, a walk to the gate — anywhere with different air. Come back in through the front door and pay attention to the first three seconds. Fifteen minutes is enough to reset a great deal of adaptation, and those three seconds are the closest you will get to smelling your own home as a guest does.
4. Better still, use an actual guest. Do not announce the diffuser. Let someone who has just arrived from outside spend two minutes in the room, then ask them a neutral question about it. A visitor's nose is an uncalibrated instrument, but it is an unadapted one, and unadapted beats calibrated here.
5. Do not use the oil level as your test. A 50ml consumes something like six to eight millilitres a week, which is a few millimetres of glass — invisible in week one and only conclusive by around week four. The level answers a different question, and answers it slowly.
6. Three passes means it is working, whatever your armchair tells you. A wet line climbing, a strong held reed and a visitor who notices is a bottle doing its job. At that point the remaining conversation is about placement, reed count or whether you have bought a composition quieter than the room needs.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. Then hold that reed an inch from your nose. Do not sniff the bottle neck — the neck always smells, because vapour pools there. The reed is the emitting surface, and it is what the room is actually being offered. If the held reed is strong, the bottle is fine and your problem is downstream of it. If the held reed is faint, you have a genuine supply problem and the fix is a flip or more reeds.
3. Then leave the house for fifteen minutes. Balcony, stairwell, a walk to the gate — anywhere with different air. Come back in through the front door and pay attention to the first three seconds. Fifteen minutes is enough to reset a great deal of adaptation, and those three seconds are the closest you will get to smelling your own home as a guest does.
4. Better still, use an actual guest. Do not announce the diffuser. Let someone who has just arrived from outside spend two minutes in the room, then ask them a neutral question about it. A visitor's nose is an uncalibrated instrument, but it is an unadapted one, and unadapted beats calibrated here.
5. Do not use the oil level as your test. A 50ml consumes something like six to eight millilitres a week, which is a few millimetres of glass — invisible in week one and only conclusive by around week four. The level answers a different question, and answers it slowly.
6. Three passes means it is working, whatever your armchair tells you. A wet line climbing, a strong held reed and a visitor who notices is a bottle doing its job. At that point the remaining conversation is about placement, reed count or whether you have bought a composition quieter than the room needs.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: lift a reed and read the wet line, hold that reed an inch from your nose, then step outside for fifteen minutes and walk back in. Supply, emission, distribution — in that order. The oil level is not one of the tests.
The easiest bottle to run these tests on
SOSA Mountain Breeze · pine, sage & Indian cedar ₹849 / 50ml
Dry, resinous and completely unsweetened, which makes it unusually legible on a held reed — there is no sugar to confuse the reading, just Himalayan pine over sage and deodar cedar. It sits at 9.4 on SOSA's own internal strength scale at six reeds, second only to Fresh Brew, on an alcohol-free, phthalate-free CCT base that holds its composition through 45°C summers rather than turning bitter. Six fibre reeds in the box; 50ml lasts 6–8 weeks, 130ml ₹1,349 lasts 14–18.
Part one — three tests, three different stages of the same journey
A reed diffuser does three things in sequence, and each one can fail independently. Oil has to climb the fibre; the exposed length has to release it into the air; and the room has to carry it to where you are sitting. Almost all the confusion in this category comes from people using a single impression to judge all three stages at once. The three tests below separate them. Run them in order — they take about a minute in total — and stop at the first failure, because a failure at stage one makes the later readings meaningless.
1
TEST ONE · SUPPLY
The wet line — is oil still climbing?
Put gloves on, lift one reed straight up, and hold it against a plain background. You are looking for the boundary between the darker, saturated section and the dry section above it. On a healthy bottle that line sits well above the oil surface and the whole buried length feels damp. There are two clear failures. A line sitting high and dark right up to the exposed tip means the reed is fully saturated and has stalled — nothing more can climb because nothing is leaving, and the fix is a flip. A line barely above the oil, with a reed that feels almost dry an inch up, means the reed is not wicking: too few reeds sharing the work, too little of them immersed, or fibre that has done six months of service and wants refreshing. Wipe the reed and stand it back in the same way round; you are diagnosing, not adjusting, at this stage.
Thirty seconds, no cost, and it eliminates half the possible causes before you have touched anything else.
2
TEST TWO · EMISSION
The held reed — an inch from your nose, not the bottle neck
Garden Bloom₹799 · 8.9/10Still holding the same reed, bring it to about an inch from your nose and breathe normally rather than sniffing hard. This matters more than it sounds: the reed is the emitting surface, and the bottle neck is not. Vapour pools in the neck of any diffuser, so a neck sniff will smell wonderful on a bottle that has completely stopped delivering — it is the single most misleading check people run. A held reed that is unmistakably strong tells you the composition is intact, the oil has not degraded, and the surface is releasing. Note also that adaptation barely affects this reading, because you have only just introduced the smell at close range. If the held reed is strong and your room is silent, you have proved the fault lies in the room rather than the bottle, and you have done it in ten seconds.
The trap: sniffing the neck. It always passes, which makes it useless as a test.
3
TEST THREE · DISTRIBUTION
The returning visitor — fifteen minutes of different air
Leave the room and the house. A balcony, a stairwell, a walk to the gate — fifteen minutes in air that smells of something else is enough to release a good deal of the adaptation your nose has built up. Then come back in through the front door and attend to the first three seconds, before your nose settles again. That first breath is the only sample of your own home you will ever get that resembles a guest's. Better again, use an actual guest: say nothing about the diffuser, let them stand in the room for two minutes, then ask what they notice. In my experience the gap between what the household believes and what a visitor reports is the largest single source of complaint in this category, and it is not a product fault. It is your nose doing exactly what noses do with a constant, low, unchanging signal.
Part two — reading the three results together
Individually each test is useful; together they are diagnostic. The combination of passes and failures maps onto a specific cause, and the causes have very different prices. Here is the whole matrix in one place, with the first action for each — and note that the first action is free in every row but the last.
The diagnostic matrix
What each combination of results actually means
| Wet line | Held reed | Visitor test | What it means | First move — free |
|---|---|---|---|---|
| Pass ★ | Pass | Pass | Working. You have adapted to it, which is normal and not a fault | Nothing. Enjoy it and stop measuring |
| Pass | Pass | Fail | Supply is fine, the room is not carrying it — dead air or a draught | Move to passing air near a doorway, waist to chest height |
| High and dark | Fail | Fail | Saturated and stalled — the classic unflipped bottle | Flip all six reeds with gloves; judge again in 24 hours |
| Barely above oil | Fail | Fail | Under-wicking — too few reeds, too little immersion, or tired fibre | Push reeds deeper, add reeds, then consider refreshing them |
| Pass | Fail | Fail | Rare. Usually a bottle left in direct sun or a very hot spot | Move out of sun and heat; expect a partial recovery only |
| Pass | Pass | Pass, faintly | Working, but quieter than the room needs — composition or scale | Add reeds, then consider a second bottle rather than a bigger one |
| The honest caveat: this matrix diagnoses a bottle, not a room. If all three tests pass and the space is still not what you pictured, the honest reading is that you have reached the ceiling of a passive format — likely past roughly 250–300 sq ft of connected open volume, or you want scent on demand rather than constantly. That is a job for a Sukoon at ₹1,899, not for a third reed bottle. | ||||
Shop this guide
Three products these tests tend to point at
Fresh Brew · 9.5/10from ₹849Shop → Fresh & Grounded duo · two sources₹1,548Shop → Sukoon · when you want it on demand₹1,899Shop →
The SOSA principle
Test the reed, not the room — and then test the room with somebody else's nose.
Supply and distribution are two different failures with two different fixes. Your own impression from the sofa cannot tell them apart, and it is the reading almost everybody uses.
Part three — why you are the wrong witness in your own house
Olfactory adaptation is not a defect and it is not a matter of concentration. Your olfactory receptors report change; a constant, unvarying stimulus stops being news within minutes, and the brain quietly files it under background. This is why a scent you chose, paid for and live with becomes the one scent in the world you cannot smell, while the same bottle in a friend's flat is immediately obvious to you. It also explains the shape of the complaint. Almost nobody writes to say a diffuser never worked; they write to say it worked beautifully for a few days and then stopped. That arc — a vivid start, an apparent decline, a plateau you cannot detect — is the arc of adaptation laid on top of a completely normal three-phase curve.
The curve is worth stating because it compounds the effect. A new bottle has three days of genuine spike: the reeds are dry and drink hard, and the lightest, most volatile top notes leave first and fastest. Then there is a settle across the first fortnight as those tops finish and the heart of the composition takes over. Then comes the plateau, which holds fairly flat until the oil runs out. The plateau is the product. It is what a passive format is for — a constant low background rather than an event. But it arrives at almost exactly the moment your nose finishes adapting, so the two effects stack, and the subjective experience is of a product that has failed. Nothing has failed. You are simply reading a flat line with an instrument that only responds to slopes.
Which is why I keep pushing people towards witnesses. The fifteen-minute doorway test is free and works better than people expect, because it takes surprisingly little clean air to partially reset. A visitor is better still. And there is a third witness available to anyone: the household member who is out longest each day. If your flatmate who returns at eight in the evening can smell the living room and you, working from the next room since nine in the morning, cannot, then the bottle is not the variable. In an ordinary Indian flat with the doors open, gentle incidental traffic past the bottle is doing the distribution work, and the person who has been walking through that traffic all day is exactly the person least able to report on it.
A nose reports change. A reed diffuser, working correctly, is the absence of change.
— Sonal Sahani, SOSA
Part four — what to do about each failure, in cost order
Having identified which stage failed, here is the action list. It is ordered by what it costs rather than by how appealing it sounds, and a great many people never need to reach the paid rows at all.
The action list
Failure by failure, cheapest fix first
| Which test failed | Do this | How long before you judge | Cost |
|---|---|---|---|
| Wet line high and dark ★ | Flip all six reeds, gloves on, both ends coated | A few hours for the surge, 24 hours for the truth | Free |
| Wet line barely above the oil | Check immersion depth, then add two to four reeds | One to two days for the line to climb | Free — but shortens the bottle |
| Held reed faint after a flip | Refresh the reeds — fibre that has served months clogs | Two days | Reeds are not sold separately; use a new bottle's set |
| Visitor test failed, reed strong | Move to gentle passing air near a doorway, waist to chest, clear space | A full day of ordinary household traffic | Free |
| Visitor test faint after moving | Add a second source at the far end rather than a bigger bottle | Immediately obvious | Duo set from ₹1,548 |
| All three pass, room still quiet | Move up the composition scale — Fresh Brew 9.5 or Mountain Breeze 9.4 | Days 1–3 will flatter it; judge at week two | From ₹849 |
| All three pass, space too large | Accept the ceiling and change format | Same evening | Sukoon ₹1,899 · 270–320 sq ft |
Honest notes for buyers: the tests on this page are SOSA's own working diagnostic method, developed from in-house testing and customer correspondence in Indian homes; they are practical checks rather than instrumented measurements, and results vary with room volume, ceiling height, ventilation and season. Strength ratings are positions on SOSA's own internal scale at six fibre reeds, not an industry standard and not a concentration. Refills are oil only — 300ml ₹2,399, 500ml ₹3,499 — and you reuse your own vessel and reeds; replacement reeds are not sold separately, which is an honest gap, and our guidance is to refresh them every few months. Reed oil never goes into a Sukoon, Boond or Megh, and the water-based Hotel Collection never goes into a reed bottle. Wear gloves when flipping, stand the bottle on a tray, and keep it away from children and pets.
When the reed passes and the room fails
SOSA Fresh & Grounded duo · Morning Freshness + Mountain Breeze ₹1,548 / 2 × 50ml
The commonest result of these three tests is a bottle that is delivering properly into a room that cannot distribute it. Output per bottle is fixed, so the only way to raise the total in a space is another source — two 50ml at opposite ends of an open living-dining beat one 130ml in the middle, every time. These two share green eucalyptus, so they meet rather than clash where the air mixes. 2 × 130ml ₹2,548 if you want 14–18 weeks instead of 6–8.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
At Versailles you are taught early that your own nose is an instrument that drifts, and that the discipline is knowing when not to trust it. Evaluators work in short bursts, on blotters, with clean air between, precisely because a continuous exposure destroys your ability to judge. Then we all go home and try to assess a fragrance we have been sitting inside for eleven hours.
The held-reed test is really just a blotter, improvised. It gives you a fresh, close, unadapted reading of what the composition is actually doing, separate from what the room is doing with it — and it takes ten seconds. I would rather teach that than have someone buy a second bottle because they could not tell a supply failure from an adapted nose.
The part of this I find hardest to communicate is that a working reed diffuser is supposed to disappear on you. It is a background, not an event. If you want a room that announces itself when you walk in and quietens when you want it quiet, that is a different machine and I would rather sell you the right one. Everything here 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
Everyone else can smell my diffuser and I cannot. Is it broken?
No — that is the clearest possible evidence that it is working. Your nose has adapted to a constant, unchanging signal in the place you spend the most time. Guests and returning household members are unadapted, which is why they can report on it and you cannot. Fifteen minutes outside and a walk back in will let you sample it yourself.
Should I smell the bottle to check it?
No. Vapour pools in the neck of any diffuser, so the neck smells strong even on a bottle that has completely stalled. It is the most misleading check in the category. Lift a reed and hold that an inch from your nose instead — the reed is the surface the room is actually being offered.
What should the wet line on a reed look like?
A clear boundary sitting well above the oil surface, with the buried length damp. If it is high and dark right to the tip, the reed is saturated and has stalled — flip all six. If it sits barely above the oil, the reeds are not wicking: check immersion depth, add reeds, and consider refreshing tired fibre.
How long should I wait after a flip before judging?
Give it a few hours for the initial surge and a full day for the honest reading. The hour after a flip is deceptively strong as the newly exposed saturated end releases; that surge is not the new baseline. Judge at 24 hours, and judge with the doorway test rather than from the sofa.
Is the oil level a good way to check it is working?
It is a slow and unreliable one. A 50ml consumes roughly six to eight millilitres a week, which is a few millimetres of glass — invisible in week one and only conclusive by around week four. Use the reed and the visitor. Keep the level as a long-range check, not a diagnostic.
Is it working? · 2027
Read the reed. Then borrow somebody else's nose — yours is the only one in the house that cannot help
Reed diffusers from ₹749, with six fibre reeds in every bottle on an alcohol-free, phthalate-free, low-VOC CCT base tested through 45°C heat and 85% monsoon humidity. 50ml lasts 6–8 weeks, 130ml from ₹1,249 lasts 14–18. If what you want is scent on demand rather than a constant 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 reed diffusers → Sukoon ₹1,899
Continue the read
More on quiet bottles and slow levels
- Does slow evaporation mean it isn't working? — why the level is the wrong metric in the first place.
- Should the oil level go down every week? — the weekly arithmetic, and the four-week checkpoint.
- Should I replace the reeds if the oil isn't going down? — flip first, then judge.
- Lasting too long but not smelling — the complete guide, plus 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 how to establish whether a reed diffuser is functioning without relying on your own adapted nose. The wet-line test, the held-reed test, the fifteen-minute doorway test and the diagnostic matrix are SOSA working guidance drawn from in-house testing and customer correspondence in Indian homes, not laboratory protocols; results vary with room volume, ceiling height, ventilation, occupancy and season. The weekly oil-consumption figures quoted are arithmetic from the stated bottle life rather than measured values. Strength ratings are positions on SOSA's internal scale at six fibre 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.