★ SOSA reed diffusers · fibre reeds
Fibre reeds wick more consistently than rattan and do not clog in a monsoon, which is why a SOSA bottle is dosed for six rather than ten
★ ★ ★ ★ ★
★★★★★
"I had been using ten sticks because that is what my last diffuser said. Six fibre reeds in the SOSA bottle is genuinely more than ten rattan ones were."
Mountain Breeze 50ml
★★★★★
"My previous diffuser died every monsoon. Three Mumbai monsoons with the SOSA and the reeds are still drawing."
Garden Bloom 130ml
★★★★★
"I kept the old rattan sticks and tried them in the new bottle. They smelled of the old fragrance for weeks. Learnt my lesson."
Fresh Brew · reed mistake
★★★★★
"Six reeds and a weekly flip is the entire routine. My old set needed flipping every three days and still went quiet."
Evening Calm 50ml
★★★★★
"Refilled with the 300ml and put in the spare reeds from a finished bottle, as suggested. Like a new diffuser for a third of the price."
300ml refill ₹2,399
★★★★★
"The strength number made sense once I understood it is measured at six reeds on SOSA's own scale, not against other brands."
Bought by strength rating
★★★★★
"I had been using ten sticks because that is what my last diffuser said. Six fibre reeds in the SOSA bottle is genuinely more than ten rattan ones were."
Mountain Breeze 50ml
★★★★★
"My previous diffuser died every monsoon. Three Mumbai monsoons with the SOSA and the reeds are still drawing."
Garden Bloom 130ml
★★★★★
"I kept the old rattan sticks and tried them in the new bottle. They smelled of the old fragrance for weeks. Learnt my lesson."
Fresh Brew · reed mistake
★★★★★
"Six reeds and a weekly flip is the entire routine. My old set needed flipping every three days and still went quiet."
Evening Calm 50ml
★★★★★
"Refilled with the 300ml and put in the spare reeds from a finished bottle, as suggested. Like a new diffuser for a third of the price."
300ml refill ₹2,399
★★★★★
"The strength number made sense once I understood it is measured at six reeds on SOSA's own scale, not against other brands."
Bought by strength rating
✓ Six fibre reeds per bottle — fibre, not rattan, because rattan clogs in Indian humidity ✓ Tested through 45°C summer heat and 85% monsoon humidity ✓ Every SOSA strength rating is measured at six reeds on our own internal scale
Founder Diaries · Reed Diffusers · Reed Count
Why fibre: natural rattan has open pores that swell and clog in humidity. At 85 per cent monsoon humidity a rattan reed can stop drawing altogether; a synthetic fibre reed keeps a consistent, engineered capillary path.
What that means for the number: because a fibre reed keeps delivering at close to its initial rate for the life of the bottle, six of them do the work that a rattan set needs eight or ten to attempt — and still fades by week three.
The honest gap: we do not sell replacement reeds separately. Refills at ₹2,399 are oil only. Refresh your reeds every few months and keep spares from finished bottles.
Garden Bloom₹799 · 8.9/10This is the reason the whole range exists in fibre. Natural rattan is hygroscopic: in high humidity it takes up ambient moisture, the pore walls swell, and the channel that was carrying oil narrows or closes. At 85 per cent humidity — an ordinary August in Mumbai, Kochi or Kolkata — a rattan set can go quiet for weeks while the bottle stays visibly full. That is the classic "it has oil but no fragrance" complaint, and it is a material failure rather than a fragrance one. Fibre does not swell in the same way. We test through 45°C summer heat and 85 per cent monsoon humidity precisely because those are the two conditions that break the imported sets people compare us to, and because a reed count means nothing if the reeds stop drawing halfway through the season.
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.
The most common way to get a SOSA diffuser wrong is to set it up using instructions from a diffuser you owned before. Those instructions were written for a different reed. Every SOSA bottle ships with six fibre reeds, and six fibre reeds deliver more than six rattan ones do — more consistently, and for far longer in a humid Indian month. If you have come from a set that told you to use eight or ten sticks and expect this one to behave the same way, you will over-scent your room, empty your bottle early, and conclude that our figures are optimistic. This guide is about what makes our count our own.
Quick answers — read this first
The count: six fibre reeds — the number in the box, and the number every SOSA strength rating is measured at. Adjust from six; do not adjust from another brand's number.Why fibre: natural rattan has open pores that swell and clog in humidity. At 85 per cent monsoon humidity a rattan reed can stop drawing altogether; a synthetic fibre reed keeps a consistent, engineered capillary path.
What that means for the number: because a fibre reed keeps delivering at close to its initial rate for the life of the bottle, six of them do the work that a rattan set needs eight or ten to attempt — and still fades by week three.
The honest gap: we do not sell replacement reeds separately. Refills at ₹2,399 are oil only. Refresh your reeds every few months and keep spares from finished bottles.
The short answer
Short answer: use all six of the fibre reeds that come with your SOSA bottle. That is the dosed setting — each composition is balanced around six reeds, in an ordinary Indian room, with a weekly flip. Go down to three or four for a nursery, a bathroom or a fragrance-sensitive house; go up to eight or ten when you want the top of the format and accept a shorter bottle. Six is where the numbers on the product page come from.
The mechanism: a reed is a capillary. Rattan's channels are natural, variable and open to the air, so they absorb ambient moisture, swell and eventually block — which is why so many imported diffusers stall in a Mumbai August. SOSA's fibre reeds have an engineered, uniform capillary structure that wicks predictably through 85 per cent humidity and 45°C heat, so a count of six stays a count of six in week seven.
Shop: six fibre reeds come with every bottle — Morning Freshness ₹749, Garden Bloom and Evening Calm ₹799, Fresh Brew and Mountain Breeze ₹849, all 50ml. 130ml from ₹1,249. Free shipping above ₹499.
In this guide
Six fibre reeds, 9.4/10
Mountain Breeze · from ₹849
Holds through a monsoon
Garden Bloom · from ₹799
Oil only — reuse your vessel
300ml refill · ₹2,399
Straight answer
How many reeds should I use with a SOSA reed diffuser?
1. Use all six that came in the box. Six fibre reeds is the dosed setting for every composition we make, and the setting at which every strength figure on our site was assessed. Put all six in on day one and judge the room after forty-eight hours, once the opening spike has settled.
2. Do not carry over a count from another brand. If your last diffuser came with ten rattan sticks and told you to use them all, that instruction was compensating for a reed that loses its rate quickly. Six of ours is not a smaller version of ten of theirs.
3. Adjust down for small sealed rooms and sensitive households. Three or four reeds in a bathroom, nursery or box room. Take the spares out and stand them upright in a small glass on the tray — you will want them later.
4. Adjust up for hosting or a large living room, to eight or ten, knowing that a 50ml then runs roughly four to six weeks instead of six to eight. Ten is the top; twelve simply crowds the neck of the bottle.
5. Flip all six weekly, with gloves. Fibre holds the benefit of a flip longer than rattan does, which is why our cadence is weekly where a rattan set often wants more. It is not optional at any count.
6. Refresh the reeds every few months, and always when you refill. Reeds are the consumable; the oil is the stable part. Most people have that the wrong way round. We do not sell reeds as a separate item — an honest gap — so keep the spares from a finished bottle.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. Do not carry over a count from another brand. If your last diffuser came with ten rattan sticks and told you to use them all, that instruction was compensating for a reed that loses its rate quickly. Six of ours is not a smaller version of ten of theirs.
3. Adjust down for small sealed rooms and sensitive households. Three or four reeds in a bathroom, nursery or box room. Take the spares out and stand them upright in a small glass on the tray — you will want them later.
4. Adjust up for hosting or a large living room, to eight or ten, knowing that a 50ml then runs roughly four to six weeks instead of six to eight. Ten is the top; twelve simply crowds the neck of the bottle.
5. Flip all six weekly, with gloves. Fibre holds the benefit of a flip longer than rattan does, which is why our cadence is weekly where a rattan set often wants more. It is not optional at any count.
6. Refresh the reeds every few months, and always when you refill. Reeds are the consumable; the oil is the stable part. Most people have that the wrong way round. We do not sell reeds as a separate item — an honest gap — so keep the spares from a finished bottle.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: six fibre reeds, because that is what each SOSA composition is dosed for and what its strength rating is measured at. Three to four for small or sensitive rooms, eight to ten for hosting. Flip weekly, refresh the reeds every few months, and ignore the stick count printed on any other brand's box.
Six fibre reeds, dosed for six
SOSA Mountain Breeze · pine, sage & Indian cedar ₹849 / 50ml
9.4 out of 10 on our internal strength scale at six reeds — the deepest woody in the range and a good demonstration of why the material matters. Real Himalayan pine over sage and deodar cedar is a heavy, resinous composition, and it is exactly the kind that clogs a natural rattan channel within weeks. On a fibre reed and a heat-stable coconut-derived CCT base it keeps drawing through 45°C heat and 85 per cent humidity, which is the difference between a bottle that plateaus and one that stalls. 130ml ₹1,349 for 14–18 weeks.
Part one — why the material changes the number
A reed is not a decoration. It is the delivery system, and the count printed on a box is a maker's estimate of how many of their reeds it takes to move enough oil into a room. Change the reed and you change the estimate. SOSA uses synthetic fibre reeds rather than natural rattan, and that single decision is why our number is six rather than the eight or ten you may be used to. Three properties do the work.
1
PROPERTY ONE · STRUCTURE
An engineered capillary against a natural one
Rattan is a plant stem. Its channels are wide, irregular and beautifully effective on day one — which is why rattan diffusers so often smell magnificent in the first week and disappointing by the third. The channels vary along the length of each stick, so within one set some sticks draw hard and some barely at all. A fibre reed is manufactured to a consistent capillary structure end to end. Six identical reeds behave like six reeds; six variable ones behave like four good ones and two ornaments. That predictability is what allows me to dose a composition for a specific count and publish figures against it. When we say a 50ml lasts six to eight weeks at six reeds, that sentence only means something because the six reeds are the same as each other and the same as the ones in your bottle.
The consequence: a stated count is only useful if every reed in the set performs. Ours do; that is the point of the material.
2
PROPERTY TWO · HUMIDITY
The monsoon test that rattan fails
Garden Bloom₹799 · 8.9/10This is the reason the whole range exists in fibre. Natural rattan is hygroscopic: in high humidity it takes up ambient moisture, the pore walls swell, and the channel that was carrying oil narrows or closes. At 85 per cent humidity — an ordinary August in Mumbai, Kochi or Kolkata — a rattan set can go quiet for weeks while the bottle stays visibly full. That is the classic "it has oil but no fragrance" complaint, and it is a material failure rather than a fragrance one. Fibre does not swell in the same way. We test through 45°C summer heat and 85 per cent monsoon humidity precisely because those are the two conditions that break the imported sets people compare us to, and because a reed count means nothing if the reeds stop drawing halfway through the season.
The tell: a full bottle, a quiet room and a wet line that has stopped climbing. On rattan, in a monsoon, that is usually the reed.
3
PROPERTY THREE · RATE OVER TIME
A flatter curve, which is what six reeds is buying
Every reed diffuser follows the same three-phase curve: a spike over the first one to three days as dry reeds saturate and the top notes leave, a settle over the first fortnight, and then a plateau that should hold to the end of the bottle. The plateau is the product. Rattan's plateau slopes downwards as residue accumulates in those open channels; fibre's is flatter, and a weekly flip restores it more completely. This is why our cadence is weekly where a rattan diffuser often needs attention every few days. It is also the honest reason six is enough: we are not trying to win week one. On a phthalate-free CCT base the opening is smaller than a solvent-driven diffuser's, and the level it settles at is one the bottle can hold until it is empty. Six reeds of a flat line beats ten reeds of a falling one by about week three, and comfortably by week six.
Part two — fibre against rattan, property by property
The comparison as plainly as I can set it out, with what each property means for the number of reeds you should actually stand in the bottle. This is a comparison of materials rather than of brands, and there are perfectly good rattan diffusers sold in drier climates than ours.
Reed materials compared
Fibre and rattan, and what each implies for your count
| Property | SOSA fibre reed | Natural rattan | What it means for your count |
|---|---|---|---|
| Capillary structure ★ | Engineered and uniform, reed to reed | Natural, variable along and between sticks | Six that all work beats ten of which four are passengers |
| Behaviour at 85% humidity | Keeps drawing; tested through Indian monsoon conditions | Pores swell and can block, sometimes entirely | Rattan sets often need more sticks to survive a season |
| Behaviour at 45°C | Stable on a heat-stable CCT carrier | Draws faster as oil thins — and empties faster | Do not raise the count in summer; heat has already raised the rate |
| Shape of the curve | Spike, settle, then a flat plateau to the end of the bottle | Bigger opening, then a sloping decline | Six fibre reeds hold; ten rattan sticks start high and fade |
| Response to flipping | Restores close to the designed rate; weekly is enough | Recovers less each time as residue builds | Our cadence is weekly, whatever your last set said |
| Typical supplied count | Six, and the compositions are dosed for six | Often eight to ten, with instructions to use them all | Never carry a count across from one to the other |
| The honest caveat: fibre is not immortal. Reeds are the consumable in this system and the oil is the stable part, which is the opposite of what most people assume. Even a fibre reed accumulates the heavy end of a composition over months, and after a monsoon it will have worked harder than usual. Refresh them every few months and whenever you refill. We do not sell replacement reeds as a separate SKU — that is a real gap in our range, not an oversight I am going to talk around — so the practical answer today is to keep the reeds from a bottle you have finished. | |||
Shop this guide
Six fibre reeds in every one of these
The SOSA principle
A reed count is a statement about a particular reed, not a universal instruction.
Six is our number because our reeds are engineered, uniform and monsoon-stable, and because each composition was balanced against exactly that. Somebody else's ten is their answer to their material.
Part three — adjusting from six, the SOSA way
Once you accept six as the origin rather than a starting bid, adjusting is simple and free. Down to four for a room you want gentler; down to three for a nursery, a small sealed bathroom or a household with someone sensitive to fragrance in it. Up to eight for a living room in hosting season, and ten if you want the top of the format for a festive month, accepting roughly four to five weeks from a 50ml instead of six to eight. Take the spare reeds out rather than cutting them, and stand them upright in a small glass on the tray — reed oil marks wood and stone, and those spares are the closest thing to replacement reeds you own. Everything on that list is reversible in ten seconds, which is what makes reed count such a satisfying control compared with buying another bottle.
Two SOSA-specific cautions are worth more than any general advice I could give you. The first: do not put reeds from a previous diffuser into a SOSA bottle. Old reeds carry their previous composition's heavy base for weeks and will muddy whatever you pour over them — and if they are rattan, you have also imported the clogging problem into a bottle designed around a different material. The second: when your oil runs out, the honest upgrade is the oil refill at ₹2,399 for 300ml, which works out around ₹7–8 per millilitre against ₹15–17 for a fresh 50ml — but it is oil only. It does not include reeds, and the commonest way to be disappointed by a refill is to pour good oil through reeds that stopped working two months ago. Remove the reeds, pour to the neck, put fresh or refreshed reeds back, and flip once so both ends are coated.
One last piece of context for the number six, because it explains the whole range. Our compositions are alcohol-free, phthalate-free, paraben-free, low-VOC and IFRA-compliant on a coconut-derived CCT carrier. Phthalate solvents push fragrance off a reed hard, which wins the first week decisively and then degrades in heat until the bottle turns acrid somewhere around week six — a trade I decided not to make when we were designing for Indian summers. The consequence is a smaller opening and a longer, flatter plateau, and six well-behaved fibre reeds is the count that plateau was built around. If you want more than six reeds' worth of room, the levers are all published: add reeds, move the bottle into passing air, or choose a louder composition — Fresh Brew at 9.5 and Mountain Breeze at 9.4. And if the space is past roughly 250–300 sq ft of connected open volume, use two bottles or a Sukoon at ₹1,899, because no count of any reed will cover it.
We chose the reed first and dosed the fragrance to it. That is why our six is not anybody else's six.
— Sonal Sahani, SOSA
Part four — the count for each composition
All five reed fragrances with what six fibre reeds does in an ordinary room, and where I would move the count if the room asks for something different. The strength numbers are positions on SOSA's own internal scale measured at six reeds — not an industry standard, not a concentration, and not a quality ranking.
The composition card
Five fragrances, six reeds, and where to move from there
| Composition | At six fibre reeds | Move down to 3–4 when | Move up to 8–10 when | 50ml / 130ml |
|---|---|---|---|---|
| Fresh Brew · 9.5 ★ | Warm, deep and enveloping — the fullest room in the range | It is going in a small kitchen or a sealed study | Hosting a large closed living room in winter | ₹849 / ₹1,349 |
| Mountain Breeze · 9.4 | Dry, resinous and grounding, with no sweetness in it | A small home office where it would distract | A library, yoga room or large bedroom you want to feel still | ₹849 / ₹1,349 |
| Morning Freshness · 9.0 | Cold and clear — reads louder than it measures | A compact bathroom, which is most bathrooms | A kitchen with the extractor running all day | ₹749 / ₹1,249 |
| Garden Bloom · 8.9 | Rounded and furnished — presence without insistence | You want a three-second greeting at the door and no more | A large entrance hall or an open living room | ₹799 / ₹1,299 |
| Evening Calm · 8.9 | The softest we make, built for sleep rather than for show | A nursery, or a shared bedroom where one of you dislikes scent | Rarely — it is not designed to be a loud fragrance | ₹799 / ₹1,299 |
| Not in the range | No oud, no musk-forward composition, no aquatic | — | — | Said plainly |
Honest notes for buyers: strength figures are positions on SOSA's own internal scale at six reeds in an ordinary Indian room — our scale, not an industry standard and not a concentration. Bottle life of 6–8 weeks for a 50ml and 14–18 weeks for a 130ml assumes six reeds, weekly flipping, no draught and no direct sun; higher counts shorten it roughly in proportion. A 130ml is not a strength upgrade — same projection at the same count, more weeks. Refills are oil only at ₹2,399 for 300ml and ₹3,499 for 500ml; they do not include reeds, and reeds are not sold separately, though our guidance is to refresh them every few months. Reed oil never goes into a Sukoon, Boond or Megh, the water-based Hotel Collection never goes into a reed bottle, and neither belongs in the waterless Vaayu. Stand the bottle on a tray, out of direct sunlight, away from children and pets. Composed and handmade in small batches in Pune; a portion of every order supports girl-child education through Nanhi Kali.
Refill the oil, refresh the reeds
SOSA reed diffuser refill · oil only ₹2,399 / 300ml
The refill is oil alone — you reuse your own glass vessel and your own reeds — at roughly ₹7–8 per millilitre against ₹15–17 for a fresh 50ml bottle, up to about 55 per cent less. A 300ml keeps a vessel going for around 8–11 months; the 500ml at ₹3,499 runs 14–18. The method matters as much as the price: remove the reeds, pour to the neck, return the reeds and flip once so both ends are coated. If those reeds have already done six months and a monsoon, put in fresh ones instead — good oil through spent reeds is the commonest way to be disappointed by a refill.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
Rattan is the romantic choice. It looks like something that grew, it photographs beautifully, and every reference diffuser I studied in France used it. Then I ran the first samples through a Pune monsoon and watched half of them stop working while the bottles were still two-thirds full. That was the week the range changed material, and the week the count became six.
People sometimes read the switch to fibre as a cost decision. It is the opposite of that: it is the decision that lets me publish a number and stand behind it. If reeds vary, a stated count is a guess and a stated bottle life is a hope. If they do not vary, I can dose a composition to six of them, test it through 45°C and 85 per cent humidity, and tell you what you will actually get in week seven.
What I have not solved is selling you replacements. Reeds are the consumable in this system and we do not yet offer them on their own, which I find genuinely irritating to write on every page. Until we do, keep the spares from a bottle you finish, refresh them every few months, and put fresh ones in when you refill. 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
How many reeds come with a SOSA reed diffuser?
Six fibre reeds, in both the 50ml and the 130ml bottle. Six is the count each composition is dosed for and the count at which every strength rating on our site was assessed. Use all six unless you are deliberately setting the room gentler or louder.
Why fibre reeds instead of rattan?
Because rattan's natural pores swell and clog in humidity, and an Indian monsoon runs at around 85 per cent. A clogged reed produces the classic complaint of a full bottle and a silent room. Fibre has a uniform engineered capillary structure that keeps drawing through heat and humidity, which is why six is enough.
Can I use reeds from my old diffuser in a SOSA bottle?
I would not. Old reeds carry their previous fragrance's heavy base for weeks and will muddy the new composition, and rattan sticks bring their clogging behaviour with them. Use the six that came in the box, and keep spares from bottles you finish for later.
Does the oil refill come with reeds?
No. The refill is oil only — 300ml at ₹2,399 or 500ml at ₹3,499 — and you reuse your own glass vessel and reeds. Reeds are not sold separately either, which is an honest gap in our range. Refresh reeds every few months, and especially at the point of refilling.
My last diffuser said to use ten sticks. Should I use ten SOSA reeds?
Not as a default. That instruction was written for a different reed with a different rate and a steeper decline. Start at six, judge after forty-eight hours, then go to eight or ten if you genuinely want the top of the format — accepting a 50ml that runs four to six weeks instead of six to eight.
SOSA reed count · 2027
Six fibre reeds, dosed for six — not a smaller version of somebody else's ten
Five reed compositions from ₹749 for 50ml (6–8 weeks) and ₹1,249 for 130ml (14–18 weeks), six fibre reeds in every bottle, alcohol-free and phthalate-free on a heat-stable CCT base tested through 45°C heat and 85% monsoon humidity. Oil-only refills ₹2,399 for 300ml. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
Shop the reed diffusers → Refill from ₹2,399
Continue the read
More on how many reeds to use
- How many reeds should you put in a reed diffuser? — six as a dose rather than a default.
- Reed count by room size and counts for a mild room — where to move from six.
- Too few sticks and too many — what going wrong looks like in each direction.
- The complete guide to choosing a reed count, 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 why SOSA bottles are dosed for six fibre reeds and why that count should not be carried over from a rattan diffuser. Material behaviour, reed-count and bottle-life figures are SOSA's own working guidance from in-house testing through 45°C heat and 85% monsoon humidity, and from customer correspondence, rather than laboratory measurement; results vary with room volume, ventilation, temperature 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.