★ SOSA reed diffusers · fewer reeds
Yes — four reeds in a 50ml runs comfortably beyond the stated eight weeks, and in a small bedroom that is not a sacrifice but the setting the room actually wanted
★ ★ ★ ★ ★
★★★★★
"Four reeds in the bedroom took my 50ml well past three months and the room is exactly as quiet as I want at night."
Evening Calm 50ml · four reeds
★★★★★
"I run six in the hall and four in the bedroom. Same brand, two completely different jobs, one shopping trip."
Day and Night duo ₹1,498
★★★★★
"Fewer reeds does stretch it, but I had to stop expecting the day-one smell. Once I accepted that, it was perfect."
Garden Bloom 50ml
★★★★★
"The fortnightly flip instead of weekly at four reeds was the tip I needed. Mine was stalling before that."
Mountain Breeze 130ml
★★★★★
"A 130ml at four reeds in the bedroom has been running since spring. Best value purchase I have made."
Evening Calm 130ml
★★★★★
"Turned out my AC vent was undoing all of it. Moved the bottle two feet and four reeds started behaving."
Morning Freshness 50ml
★★★★★
"Four reeds in the bedroom took my 50ml well past three months and the room is exactly as quiet as I want at night."
Evening Calm 50ml · four reeds
★★★★★
"I run six in the hall and four in the bedroom. Same brand, two completely different jobs, one shopping trip."
Day and Night duo ₹1,498
★★★★★
"Fewer reeds does stretch it, but I had to stop expecting the day-one smell. Once I accepted that, it was perfect."
Garden Bloom 50ml
★★★★★
"The fortnightly flip instead of weekly at four reeds was the tip I needed. Mine was stalling before that."
Mountain Breeze 130ml
★★★★★
"A 130ml at four reeds in the bedroom has been running since spring. Best value purchase I have made."
Evening Calm 130ml
★★★★★
"Turned out my AC vent was undoing all of it. Moved the bottle two feet and four reeds started behaving."
Morning Freshness 50ml
✓ Six fibre reeds per bottle — remove two for a deliberate slow setting ✓ 50ml lasts 6–8 weeks at six reeds · 130ml lasts 14–18 weeks ✓ Evening Calm 8.9 · Kashmir lavender and chamomile · handmade in Pune
Founder Diaries · Reed Diffusers · Bottle Life
What you give up: presence, and some of the composition's brightness — a smaller evaporating surface favours the heavier materials.
Where it works: a bedroom with the door shut at night, a study, a reading corner. Small, quiet, sealed-ish rooms with gentle air.
The adjustment nobody mentions: at four reeds you can flip fortnightly rather than weekly, because each reed accumulates residue more slowly than a crowded set does.
Garden Bloom₹799 · 8.9/10Weekly flipping is calibrated around six reeds. At four, each reed is moving less material per day and accumulating heavy residue more slowly, so a fortnightly flip is usually enough — gloves on, all four, bottle standing on a tray. What you must not do is stop flipping altogether on the theory that a slow bottle should be left alone. A stalled reed is not a bottle lasting longer; it is a bottle that has quietly stopped working, and the extra weeks it appears to gain are weeks of nothing. Use the wet-line test to tell the difference: lift a reed and find the boundary between oil-soaked and dry fibre. High and dark means saturated and stalled, so flip. Barely above the oil means it is not wicking, and at a low count that usually points to reeds at the end of their life. Normal line but a silent room means airflow or your own adaptation.
Evening Calm · 8.9/10from ₹799Shop → 
Day & Night duo · 2 × 50ml₹1,498Shop → 
Oil refill · 300ml₹2,399Shop →
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.
Yes, it does — and this is the one place in the reed-count conversation where doing less is a design decision rather than a mistake. Four reeds in a 50ml bedroom bottle runs comfortably past the stated six to eight weeks, and in a small room with the door shut at night it gives you exactly the level most people wanted in the first place. I am not talking about rationing a bottle you cannot afford to run. I am talking about a deliberate configuration: a quieter room, a longer bottle, and a set of small adjustments that make the low setting work properly rather than simply work less.
Quick answers — read this first
The arithmetic: bottle life moves roughly in proportion to reed count. Six reeds on a 50ml is 6–8 weeks; four runs comfortably beyond that window in an ordinary room.What you give up: presence, and some of the composition's brightness — a smaller evaporating surface favours the heavier materials.
Where it works: a bedroom with the door shut at night, a study, a reading corner. Small, quiet, sealed-ish rooms with gentle air.
The adjustment nobody mentions: at four reeds you can flip fortnightly rather than weekly, because each reed accumulates residue more slowly than a crowded set does.
The short answer
Short answer: yes. Fewer reeds means less exposed evaporating surface, so oil leaves more slowly and the bottle lasts longer — roughly in proportion. Four reeds in a 50ml takes you past the stated 6–8 weeks; the same four in a 130ml turns 14–18 weeks into a genuinely long-running bedroom bottle. The trade is honest and it is not free: you are buying weeks with presence. Conservation and strength are the same dial turned in opposite directions.
The mechanism: reeds are wicks, not pumps. Oil climbs by capillary action and leaves from the fibre standing in air, so total exposed surface sets the rate. Remove two reeds and you remove roughly a third of the surface — the room gets quieter the same day and the bottle stops draining as fast from that moment on.
Shop: the composition built for this setting is Evening Calm — Kashmir lavender and chamomile, 8.9 on our internal scale at six reeds, ₹799 for 50ml and ₹1,299 for 130ml. For a house that wants six reeds in the hall and four in the bedroom, the Day & Night duo is ₹1,498 for 2 × 50ml. Free shipping above ₹499.
In this guide
Built for a quiet bedroom
Evening Calm 8.9 · from ₹799
Six in the hall, four in the bedroom
Day & Night duo · ₹1,498
Lower the running cost properly
300ml oil refill · ₹2,399
Straight answer
Does using fewer reeds make a reed diffuser last longer?
1. Yes, and roughly in proportion. Reed count sets the exposed evaporating surface, and surface sets the rate at which oil leaves. Six reeds gives a 50ml its stated 6–8 weeks. Four takes it comfortably beyond that window in an ordinary room, and does so from the moment you pull the two reeds out.
2. You are paying for those weeks with presence. This is the honest half of the sentence. A four-reed room is quieter, and it also reads a little softer and rounder, because a smaller surface favours the slower, heavier materials in a composition.
3. Four is the sensible floor for a real room. Three works in a small sealed space. One or two falls below the level an ordinary room can hold on to, and at that point you are not conserving the fragrance, you are simply not receiving it.
4. Match the composition to the setting. Evening Calm and Garden Bloom hold their shape at four reeds better than a bright citrus does, because they lean on materials that were never in a hurry.
5. Adjust the flip cadence. Weekly is the default at six. At four you can go fortnightly — fewer reeds accumulate heavy residue more slowly — but do not abandon it, because a stalled reed at any count is a bottle that has stopped working rather than one that is lasting.
6. Protect the setting from the room. A draught from an AC or fan will strip four reeds faster than it strips six as a share of the whole, and direct sun heats the oil. Both undo the saving completely.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. You are paying for those weeks with presence. This is the honest half of the sentence. A four-reed room is quieter, and it also reads a little softer and rounder, because a smaller surface favours the slower, heavier materials in a composition.
3. Four is the sensible floor for a real room. Three works in a small sealed space. One or two falls below the level an ordinary room can hold on to, and at that point you are not conserving the fragrance, you are simply not receiving it.
4. Match the composition to the setting. Evening Calm and Garden Bloom hold their shape at four reeds better than a bright citrus does, because they lean on materials that were never in a hurry.
5. Adjust the flip cadence. Weekly is the default at six. At four you can go fortnightly — fewer reeds accumulate heavy residue more slowly — but do not abandon it, because a stalled reed at any count is a bottle that has stopped working rather than one that is lasting.
6. Protect the setting from the room. A draught from an AC or fan will strip four reeds faster than it strips six as a share of the whole, and direct sun heats the oil. Both undo the saving completely.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: yes — four reeds in a 50ml runs past the stated eight weeks and gives a bedroom the level it usually wanted anyway. You buy the weeks with presence, so choose a soft composition, flip fortnightly, keep the bottle out of draughts and sun, and do not go below three.
The composition this setting was made for
SOSA Evening Calm · Kashmir lavender & chamomile ₹799 / 50ml
At six reeds this sits at 8.9 on SOSA's internal scale and is the softest thing we make — a sleep fragrance rather than a hosting one. At four reeds in a closed bedroom it becomes something quieter still and runs well past the stated 6–8 weeks, which is the whole point of the configuration. Lavender and chamomile are slow, patient materials, so they hold their character at a reduced surface where a citrus would thin out. Alcohol-free, phthalate-free, on a heat-stable CCT base. 130ml ₹1,299 for 14–18 weeks at six, longer at four.
Part one — the trade, and the three things that make it work
Running four reeds is not simply running six badly. It is a different setting with its own maintenance, its own choice of fragrance and its own failure modes, and the people who are happiest with it are the ones who treat it that way. Conservation and strength are the same dial turned opposite ways, so the question is not whether you are giving something up — you are — but whether what you are giving up is something that room ever needed.
1
THE TRADE
What four reeds buys, and what it charges
Removing two of six reeds removes roughly a third of the exposed surface, and bottle life moves with it. On a 50ml rated 6–8 weeks at six reeds, four runs comfortably past the top of that window in an ordinary room; on a 130ml rated 14–18 weeks, four turns it into a bottle you stop thinking about for most of a season. The charge is presence, and a subtler change in character: a smaller surface preferentially delivers the slower materials, so the fragrance reads rounder, softer and slightly more base-led than it does at six. In a bedroom at night that is often an improvement rather than a loss. In a living room with people in it, it is a loss, and you will notice within a week.
The rule: choose the low count for the room you want quiet, not for the bottle you want to stretch.
2
THE MAINTENANCE
Fortnightly flips, and a different wet line to look for
Garden Bloom₹799 · 8.9/10Weekly flipping is calibrated around six reeds. At four, each reed is moving less material per day and accumulating heavy residue more slowly, so a fortnightly flip is usually enough — gloves on, all four, bottle standing on a tray. What you must not do is stop flipping altogether on the theory that a slow bottle should be left alone. A stalled reed is not a bottle lasting longer; it is a bottle that has quietly stopped working, and the extra weeks it appears to gain are weeks of nothing. Use the wet-line test to tell the difference: lift a reed and find the boundary between oil-soaked and dry fibre. High and dark means saturated and stalled, so flip. Barely above the oil means it is not wicking, and at a low count that usually points to reeds at the end of their life. Normal line but a silent room means airflow or your own adaptation.
The tell: a four-reed bottle that has lasted five months and smells of nothing has not lasted. It has stopped.
3
THE PROTECTION
A low count is more fragile to the room, not less
The saving you have just engineered is easy to lose. A split AC blowing across the bottle or a ceiling fan directly above strips reeds hard — the room still smells of very little because the fragrance is carried away before it distributes, and the bottle empties weeks early anyway. That combination costs you on both sides at once, and at four reeds it can wipe out the entire gain. Direct sunlight does the same by heating the oil: warmer oil is thinner and leaves faster, and a west-facing shelf in a Pune or Delhi summer is the harshest place in the flat. What a slow setting wants is a shelf or console with gentle incidental air, roughly waist to chest height, clear space around the glass, and no sun on it. Our compositions sit on a heat-stable coconut-derived CCT carrier tested through 45°C summers and 85% monsoon humidity, so they hold their character in Indian conditions where cheaper solvent bases turn acrid — but no carrier makes a bottle immune to a draught.
Part two — a four-reed bedroom bottle, week by week
This is what the configuration actually feels like over a season, written for a 50ml in a closed bedroom of ordinary size. The three-phase curve every reed diffuser follows is still there at four reeds; it is simply flatter and longer.
The slow curve
Four reeds in a 50ml, from opening to the end
| Stage | What the room smells like | What the bottle looks like | What to do |
|---|---|---|---|
| Days 1–3 ★ | A brief spike — dry reeds drinking hard, top notes leaving at once | A visible drop as the fibre saturates | Nothing. This is not the level you have bought |
| Weeks 1–2 | Settling down; noticeably softer each evening | Falling slowly and evenly | First flip at the end of week two |
| Weeks 3–8 | The plateau — quiet, steady, present when you come in from outside | Roughly a third to a half gone | Fortnightly flip; ignore your own nose, ask a guest |
| Weeks 9–12 | Still on the plateau; rounder and more base-led than at six reeds | Low, but the reeds are still climbing well | Check the wet line; refresh reeds if dark or stiff |
| The end | Fading over days rather than stopping | Reeds no longer fully submerged | Refill with oil to the neck, return the reeds, flip once |
| The honest caveat: the weeks in this table are a picture of a well-placed bottle in an ordinary closed bedroom, not a promise. Heat, draught, ceiling height and how often the door is open move it substantially, and a bottle in a draught can undercut the six-reed figure even at four reeds. Bottle-life figures are SOSA's working guidance from in-house testing and customer correspondence, not laboratory measurements. | |||
Shop this guide
Three ways to run a room slowly
Evening Calm · 8.9/10from ₹799Shop → Day & Night duo · 2 × 50ml₹1,498Shop → Oil refill · 300ml₹2,399Shop →
The SOSA principle
A slow bottle is only an achievement if the room still smells of something.
Fewer reeds genuinely extends bottle life, and four in a bedroom is a setting I recommend without hesitation. Below that you are not lasting longer, you are storing oil — and an open bottle does not store well.
Part three — the long slow bedroom, in practice
Here is the configuration as I run it at home, because it is the one arrangement in this whole cluster I would describe as a genuine recommendation rather than a permitted deviation. A 50ml of Evening Calm at ₹799, four reeds instead of six, on a chest of drawers at roughly chest height, three or four feet from the doorway, on a small tray, with nothing overhanging it and no sun reaching it at any hour. The door is shut most of the night, so the room holds what little is delivered instead of trading it constantly with the corridor. The bottle gets flipped every second Sunday, gloves on. It runs well past the stated eight weeks — and the room is not perfumed in the way a hall is perfumed, it is faintly, consistently pleasant when you walk in from outside. That last clause is the important one, because it is also the only reliable way you will ever judge it.
Your nose will not help you here. Olfactory adaptation is the commonest cause of the sentence it has stopped working, and it bites hardest at low counts in a room you sleep in — you stop reporting a constant within minutes, and you enter that room a dozen times a day. So the honest test is the doorway one: leave the flat for fifteen minutes, come back in without preparing yourself for it, and notice what you notice. Or ask somebody who does not live there. If a guest can tell the bedroom smells of lavender and you cannot, the configuration is working exactly as intended and no change is needed. If neither of you can tell, then something has gone wrong that is not the reed count — usually a draught, a stalled set of reeds, or a bottle sitting in dead air where nothing carries the fragrance out.
Two more notes and then the honest boundary. First, this is the one place where the 130ml earns its price for reasons that have nothing to do with strength: 130ml at ₹1,299 is rated 14–18 weeks at six reeds, so at four in a bedroom it becomes a bottle you genuinely stop managing. It is not louder — at the same count it projects the same, and I will not sell a bigger bottle as a strength upgrade — it simply lasts. Second, if the reason for four reeds is running cost rather than a quiet room, the oil refill is the better instrument: ₹2,399 for 300ml at roughly ₹7–8 per millilitre against ₹15–17 for a fresh 50ml. It is oil only — you reuse your own vessel and your own reeds, no reeds come with it, and we do not sell them separately, which is an honest gap in the range. And the boundary: four reeds is a bedroom setting. It will not do a living-dining, it will not do a hosting evening, and if what you want is a room that can be made strong on demand, that is a Sukoon at ₹1,899 rather than a reed bottle run at any count at all.
Four reeds in a bedroom is not a bottle being rationed. It is a room being tuned.
— Sonal Sahani, SOSA
Part four — slow-room configurations, and what each one costs
Four ways to run a room quietly and long, with the honest span for each. All of them assume gentle air, no draught, no direct sun and a flip you have not abandoned.
The slow-room edit
Setups for a long, quiet bottle
| Setup | Character in the room | Honest span | Price |
|---|---|---|---|
| Evening Calm 50ml, four reeds ★ | Soft, lavender-led, present only when you come in from outside | Comfortably beyond the stated 6–8 weeks | ₹799 |
| Evening Calm 130ml, four reeds | The same character, on a bottle you stop managing | Beyond 14–18 weeks — most of a season | ₹1,299 |
| Garden Bloom 50ml, four reeds | Rounder and rosier; the jasmine recedes politely | Past the stated window, similar to Calm | ₹799 |
| Mountain Breeze 50ml, four reeds | Mostly Indian cedar — dry and grounding, less mountain | Past the stated window; good in a study | ₹849 |
| Six in the hall, four in the bedroom | Two rooms tuned separately from one purchase | Each bottle to its own count | Day & Night duo ₹1,498 |
| Any of the above, refilled | Unchanged — the refill is the same formula as the bottles | 8–11 months on 300ml, 14–18 on 500ml | ₹2,399 · ₹3,499 |
| Not a slow setting: one or two reeds | Below what an ordinary room can hold on to | The oil ages faster than you receive it | Said plainly rather than sold |
Honest notes for buyers: spans on this page assume four reeds, gentle air, weekly-to-fortnightly flipping, no draught and no direct sun — every deviation has a price in days, and heat is the largest single accelerant. Replacement reeds are not sold as a separate SKU; guidance is to refresh them every few months, sooner after a monsoon. The refill is oil only at 300ml ₹2,399 and 500ml ₹3,499, roughly ₹7–8 per millilitre against ₹15–17 for a fresh 50ml, and no reeds are included. A 130ml is not louder than a 50ml at the same count — it lasts longer, which is a different and perfectly good reason to buy it. Strength figures are positions on SOSA's own internal scale at six reeds, not an industry standard. 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, flip with gloves, and keep it away from children and pets. Handmade in small batches in Pune; a portion of every order supports girl-child education through Nanhi Kali.
Two rooms, two counts, one purchase
SOSA Day & Night duo · Morning Freshness + Evening Calm ₹1,498 / 2 × 50ml
The most common sensible arrangement in an Indian flat: Morning Freshness at six reeds where the day happens — a kitchen, a hall, a home office — and Evening Calm at four in the bedroom, running long and quiet. Two different jobs, two different counts, and both bottles doing what they were composed for. Morning Freshness is 9.0 on our internal scale and Evening Calm 8.9, the brightest and the softest in the range. 2 × 130ml ₹2,498 if you would rather manage them twice a year than every couple of months.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
I get asked to defend the six-reed dose so often that I want to be clear about where I am happy to abandon it. A bedroom is one of those places. The room is small, the door is shut for eight hours, and what you want from fragrance there is not presence — it is a faint reassurance that the room has been looked after. Six reeds of anything can be slightly too much of a good thing in that context.
So I run four at home, in Evening Calm, and I flip it every second Sunday. It lasts well past what the label promises and I have never once wished it were louder at eleven at night. That is not a compromise I am tolerating; it is the setting I would choose even if the oil were free.
Where I would push back is on going lower to save money. An open bottle is not storage — the brightest part of a composition leaves on its own schedule whether or not you are there to receive it, so a bottle stretched to five months on two reeds is not thrift, it is a slow loss. If cost is the issue, use the refill and keep the count honest. 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
Do fewer reeds make a reed diffuser last longer?
Yes, roughly in proportion to the surface you remove. Four reeds instead of six on a 50ml takes it comfortably past the stated 6–8 weeks, and on a 130ml past 14–18. The trade is presence: a smaller evaporating surface means a quieter room and a slightly softer, more base-led reading of the composition. In a bedroom that is often exactly what you wanted.
How many reeds should I use in a bedroom?
Four is my standing recommendation for a closed bedroom of ordinary size, in a soft composition such as Evening Calm at ₹799. Put the bottle at chest height a few feet from the doorway, on a tray, away from an AC vent and out of the sun. Six is right for a hall or a kitchen; three suits a nursery or a very small sealed room.
Should I still flip the reeds if I am using fewer of them?
Yes, just less often. Weekly is calibrated around six reeds; at four a fortnightly flip is usually enough, because each reed accumulates heavy residue more slowly. Do not stop entirely — a stalled reed is not a bottle lasting longer, it is a bottle that has stopped working, and the wet-line test will tell you which one you have.
Is a 130ml better than a 50ml if I want it to last?
For duration, yes — 14–18 weeks against 6–8 at the same six reeds, and longer still at four. What it will not do is smell stronger; at the same count it projects about the same, and buying up a size hoping for a louder room is the commonest wasted purchase in this category. Buy the 130ml because you would rather think about it twice a year.
What is the lowest reed count worth using?
Three, and only in a small sealed room. Below that the delivery rate falls under what an ordinary room clears, so you perceive nothing while the open bottle keeps losing its brightest materials to time. If the goal is a lower running cost rather than a quieter room, the oil refill at roughly ₹7–8 per millilitre is the right tool instead.
Reed count · 2027
Four reeds, a soft composition, a shut door. That is a bedroom that lasts a season
Evening Calm at 8.9/10 from ₹799 for 50ml and ₹1,299 for 130ml — 6–8 and 14–18 weeks at six reeds, longer at four. Day & Night duo ₹1,498 for 2 × 50ml when the hall wants six and the bedroom wants four. Oil-only refills ₹2,399 for 300ml at roughly ₹7–8 per millilitre. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
Shop Evening Calm → Day & Night duo ₹1,498
Continue the read
More on reed count
- What happens if you use too few? — where a slow setting turns into waste.
- How many reeds for a mild fragrance and how many by room size — choosing a count deliberately.
- How many reeds should you put in? — why six is the dose everything is rated at.
- The complete guide to choosing a reed count — 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 running a reed diffuser at a deliberately low count for a quieter room and a longer bottle. Reed-count and bottle-life figures are SOSA's own working guidance from in-house testing and customer correspondence, not laboratory measurements; real results vary with room volume, ceiling height, ventilation 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.