★ SOSA reed diffusers · refilling
A refill replaces the payload. It does not replace the delivery system, and the delivery system is the part that wears out
★ ★ ★ ★ ★
★★★★★
"I refilled twice through the same reeds before anyone told me the reeds were the problem. Third time I used fresh ones and it was a different room."
300ml refill ₹2,399
★★★★★
"The sixty-second check before pouring is the single most useful thing I have read about diffusers."
Mountain Breeze 130ml
★★★★★
"Worked out at roughly half the per-millilitre cost of buying bottles. Two years of Evening Calm from one 500ml."
500ml refill ₹3,499
★★★★★
"Clear that reeds are not sold on their own. I now buy a 50ml once a year purely for the reeds and refill the rest."
Refill plus a bottle
★★★★★
"Removing the reeds before pouring, then flipping once — such a small thing and it fixed my messy refills."
Garden Bloom refill
★★★★★
"My reeds were four months old and tacky. Fresh fibre with the same oil brought the whole living room back."
Fresh Brew 50ml
★★★★★
"I refilled twice through the same reeds before anyone told me the reeds were the problem. Third time I used fresh ones and it was a different room."
300ml refill ₹2,399
★★★★★
"The sixty-second check before pouring is the single most useful thing I have read about diffusers."
Mountain Breeze 130ml
★★★★★
"Worked out at roughly half the per-millilitre cost of buying bottles. Two years of Evening Calm from one 500ml."
500ml refill ₹3,499
★★★★★
"Clear that reeds are not sold on their own. I now buy a 50ml once a year purely for the reeds and refill the rest."
Refill plus a bottle
★★★★★
"Removing the reeds before pouring, then flipping once — such a small thing and it fixed my messy refills."
Garden Bloom refill
★★★★★
"My reeds were four months old and tacky. Fresh fibre with the same oil brought the whole living room back."
Fresh Brew 50ml
✓ Refills are oil only — you reuse your own glass vessel and reeds ✓ 300ml ₹2,399 ≈ 8–11 months · 500ml ₹3,499 ≈ 14–18 months · about ₹7–8 per ml ✓ Replacement reeds are not sold separately; SOSA guidance is to refresh them every few months
Founder Diaries · Reed Diffusers · Refilling
Use fresh reeds if the fibre is dark and tacky, stiff, crusted at the neck, or if a flip has stopped producing anything. That is a spent delivery system, and new oil cannot fix it.
The refill contains oil only: 300ml ₹2,399 for roughly 8–11 months, 500ml ₹3,499 for 14–18. About ₹7–8 per millilitre against ₹15–17 for a 50ml bottle.
SOSA does not sell reeds separately — a genuine gap. Six fresh fibre reeds arrive with every new bottle; plain reeds from a craft supplier work in between. Refresh every few months.
Mountain Breeze₹849 · 9.4/10A reed passes many times its own volume of oil and keeps the heaviest part of every pass. Add dust from the room, and the capillary channels narrow month by month until flow is a fraction of what it was. Our guidance is to refresh reeds every few months — sooner at nine or ten reeds, because more exposed surface collects residue faster, and sooner after a monsoon. Fibre helps, and it is why we use it rather than rattan, whose natural pores swell and clog at the 85% humidity of an Indian July. But fibre delays the wear, it does not abolish it. Set yourself a calendar reminder if that is what it takes; it is a better system than waiting for the room to go quiet.
300ml refill · oil only₹2,399Shop → 
Evening Calm · six fresh reedsfrom ₹799Shop → 
Fresh Brew · six fresh reedsfrom ₹849Shop →
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.
Our refill is oil and nothing else. That is a deliberate design — you keep your own glass vessel and your own reeds, and the oil comes in at roughly half the price per millilitre of a fresh bottle. It also creates the single most avoidable disappointment in the range. If you pour 300ml of perfectly good oil through six reeds that stopped working two months ago, the room will not change, and you will conclude that the refill is weaker than the bottle. It is not. It is the same composition arriving through a closed pipe.
Quick answers — read this first
Refill with your existing reeds only if they are young and still wicking — under about two months, supple, and a flip still lifts the room.Use fresh reeds if the fibre is dark and tacky, stiff, crusted at the neck, or if a flip has stopped producing anything. That is a spent delivery system, and new oil cannot fix it.
The refill contains oil only: 300ml ₹2,399 for roughly 8–11 months, 500ml ₹3,499 for 14–18. About ₹7–8 per millilitre against ₹15–17 for a 50ml bottle.
SOSA does not sell reeds separately — a genuine gap. Six fresh fibre reeds arrive with every new bottle; plain reeds from a craft supplier work in between. Refresh every few months.
The short answer
Short answer: not always, but far more often than people do. Reeds and oil wear out on completely different clocks. A 50ml of oil is gone in six to eight weeks and a 130ml in fourteen to eighteen; a set of reeds is good for a few months at most, sooner at high reed counts and sooner after a monsoon. If you refill on the oil's clock and never on the reeds', you will eventually be running fresh fragrance through fibre that is several bottles old.
The mechanism: the reed is the delivery system and the oil is the payload. Over time the fibre's capillary channels are lined with the heaviest, least volatile parts of the fragrance and with whatever dust the room has contributed, and flow narrows. Because the bottle still looks full and the oil is visibly fresh, the fault is invisible — the level simply stops falling and the room stays quiet. The correct decision is made before you pour, in about a minute, with a gloved hand.
Shop: the refill is ₹2,399 for 300ml and ₹3,499 for 500ml, oil only, in the same five compositions as the bottles. If your reeds are also due, the tidiest answer is a 50ml bottle from ₹749 — which arrives with six fresh fibre reeds — alongside the refill. Free shipping above ₹499.
In this guide
Oil only, about half the per-ml price
300ml refill · ₹2,399 · 8–11 months
Where fresh reeds come from
50ml bottle · from ₹749 · six fibre reeds
The gentlest to refill into
Evening Calm · from ₹799
Straight answer
Do I need new reeds when I refill my reed diffuser?
1. Check the reeds before you open the refill, not after. Lift one with a gloved hand. Supple, lightly oily, wet line well up the fibre — reuse it. Stiff, tacky, dark with a dull crust near the neck — it is spent, and pouring fresh oil through it is the mistake this page exists to prevent.
2. The flip is the deciding test. Invert all six, return them, and wait a day. A healthy set lifts the room within hours. If nothing changes by the next morning, no quantity of new oil will change it either.
3. Reeds and oil are on different clocks. A 50ml empties in six to eight weeks, a 130ml in fourteen to eighteen. Reeds want refreshing every few months. Roughly speaking, that is every second or third 50ml, or with each 130ml — sooner at nine or ten reeds, and sooner after a monsoon.
4. If you are refilling the same fragrance into young reeds, reuse is not a compromise — it is the design. The residue in the fibre is that same composition's base, so it adds nothing foreign. Remove the reeds, pour to the neck, return them, flip once so both ends are coated.
5. If you are changing fragrance, use fresh reeds regardless of age. The old composition's base will ghost the new one for two to four weeks.
6. We do not sell replacement reeds, and I would rather name the gap than talk around it. Six fresh fibre reeds arrive with every new bottle, and plain undyed reeds from a craft or packaging supplier are a perfectly serviceable in-between. Many customers buy one 50ml a year purely for its reeds and run refills the rest of the time.
7. Do not throw away the glass. The vessel is the part that genuinely lasts — wash it, dry it thoroughly, and it will outlive many sets of reeds.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
2. The flip is the deciding test. Invert all six, return them, and wait a day. A healthy set lifts the room within hours. If nothing changes by the next morning, no quantity of new oil will change it either.
3. Reeds and oil are on different clocks. A 50ml empties in six to eight weeks, a 130ml in fourteen to eighteen. Reeds want refreshing every few months. Roughly speaking, that is every second or third 50ml, or with each 130ml — sooner at nine or ten reeds, and sooner after a monsoon.
4. If you are refilling the same fragrance into young reeds, reuse is not a compromise — it is the design. The residue in the fibre is that same composition's base, so it adds nothing foreign. Remove the reeds, pour to the neck, return them, flip once so both ends are coated.
5. If you are changing fragrance, use fresh reeds regardless of age. The old composition's base will ghost the new one for two to four weeks.
6. We do not sell replacement reeds, and I would rather name the gap than talk around it. Six fresh fibre reeds arrive with every new bottle, and plain undyed reeds from a craft or packaging supplier are a perfectly serviceable in-between. Many customers buy one 50ml a year purely for its reeds and run refills the rest of the time.
7. Do not throw away the glass. The vessel is the part that genuinely lasts — wash it, dry it thoroughly, and it will outlive many sets of reeds.
Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: refill into your existing reeds if they are under about two months old, supple, and still respond to a flip. Use fresh fibre if they are dark and tacky, or if you are changing fragrance. The refill is oil only at ₹2,399 for 300ml; reeds are not sold separately, so fresh ones come with a new bottle or from a craft supplier.
What the refill is, stated plainly
SOSA reed diffuser refill · oil only ₹2,399 / 300ml
Three hundred millilitres of the same composition that goes into the bottles, in the same five scents, on the same alcohol-free, phthalate-free, heat-stable CCT base — and nothing else in the box. You reuse your own glass vessel and your own reeds. At roughly ₹7–8 per millilitre against ₹15–17 for a 50ml bottle, it is up to about 55% less for the same fragrance, and a 300ml keeps a vessel running for around 8–11 months. The 500ml at ₹3,499 runs 14–18 months. The only thing it cannot do is replace tired fibre.
Part one — two clocks, running at different speeds
Almost every refill mistake comes from treating a reed diffuser as one object with one lifespan. It is two systems bolted together, and they age independently. The oil is consumed; the reeds are worn. Consumption is visible — the level drops, you notice, you buy more. Wear is invisible, because a worn reed looks much like a working one from three feet away and there is no moment at which it announces itself. That asymmetry is the whole problem, and these three cards are the whole solution.
1
CLOCK ONE · THE OIL
Consumed on a schedule you can see
A 50ml at six reeds in an ordinary room gives you six to eight weeks; a 130ml gives fourteen to eighteen. That range is not vague for the sake of it — it moves with heat, draught, reed count and how often you flip. What matters here is that the oil's clock is honest. You can mark the glass with a strip of tape and watch it fall, and when it is nearly gone you know exactly what to do. Nobody has ever needed a guide to notice that a bottle is empty. The refill exists precisely because this clock is easy: you already know when to act, and buying oil alone is much cheaper than buying oil in a new vessel with new fibre every time.
The rule: the oil tells you when it needs replacing. The reeds never will.
2
CLOCK TWO · THE REEDS
Worn on a schedule nobody watches
Mountain Breeze₹849 · 9.4/10A reed passes many times its own volume of oil and keeps the heaviest part of every pass. Add dust from the room, and the capillary channels narrow month by month until flow is a fraction of what it was. Our guidance is to refresh reeds every few months — sooner at nine or ten reeds, because more exposed surface collects residue faster, and sooner after a monsoon. Fibre helps, and it is why we use it rather than rattan, whose natural pores swell and clog at the 85% humidity of an Indian July. But fibre delays the wear, it does not abolish it. Set yourself a calendar reminder if that is what it takes; it is a better system than waiting for the room to go quiet.
The tell: a bottle that suddenly seems to last far longer than usual is a worn reed, not a bargain.
3
THE SIXTY-SECOND CHECK
What to do before you open the refill
Gloves on, tray under the bottle. Lift one reed clear and look at the wet line — the boundary between oil-soaked and dry fibre. Well up the reed and climbing is healthy; barely above the oil after weeks in place is not. Roll the exposed end between two fingers: supple and lightly oily is right, stiff and tacky is not, and a dull crust where the reeds met the neck is a clear verdict. Finally, hold the reed a few inches from your nose. A working reed smells like the fragrance; a spent one smells flat, dark and base-heavy, because you are smelling the residue rather than the composition. If two of those three readings are poor, put the refill down and sort the reeds out first. It takes a minute and it is the difference between ₹2,399 well spent and ₹2,399 poured into a room that will not receive it.
Part two — what ₹2,399 actually buys, component by component
Written out plainly, because the confusion is entirely reasonable — most refill products in adjacent categories do include hardware, and ours does not. This is what is in the box, what is not, and what condition each part of your existing setup is likely to be in after one bottle's worth of use.
The refill, itemised
Five components, and who is responsible for each
| Component | In the refill box | Condition after one bottle | Who replaces it | What it costs you |
|---|---|---|---|---|
| The fragrance oil ★ | Yes — 300ml or 500ml, same five compositions | Consumed; that is why you are here | The refill | ₹2,399 / ₹3,499 · about ₹7–8 per ml |
| The glass vessel | No | Perfect, if it has stood on a tray | Nobody — it is designed to be kept | Nothing. Wash and dry thoroughly |
| The six fibre reeds | No | Usable after one 50ml; usually tired after a 130ml | You, every few months | Not a SOSA SKU — see the caveat below |
| The neck and collar | No | Often carries a light residue ring | You — wipe it at each refill | Nothing |
| Tray, gloves, common sense | No | Reed oil marks wood and stone permanently | You, before you pour | Nothing, and it saves a table |
| The honest caveat: SOSA does not sell replacement reeds as a separate product. It is the most requested thing we do not stock, and I will not dress it up. The two practical answers are a new bottle — 50ml from ₹749, 130ml from ₹1,249, each arriving with six fresh fibre reeds — or plain undyed reeds from a craft or packaging supplier. Our standing guidance is to refresh reeds every few months rather than run them until the room goes quiet. | ||||
Shop this guide
Oil, fibre, or both
300ml refill · oil only₹2,399Shop → Evening Calm · six fresh reedsfrom ₹799Shop → Fresh Brew · six fresh reedsfrom ₹849Shop →
The SOSA principle
Refill the payload on the oil's clock. Refresh the delivery on the reeds'.
They are different intervals and they will almost never coincide. Anyone who refills only when the bottle empties is, over a year or two, guaranteed to be running new oil through old fibre.
Part three — the economics, and the gap in the middle
The case for refilling is straightforward and I have no interest in overstating it. A 300ml at ₹2,399 works out at roughly ₹8 per millilitre; a 500ml at ₹3,499 comes closer to ₹7. A 50ml bottle at ₹749 to ₹849 is ₹15–17 per millilitre, because you are also paying for glass, fibre, a box and the labour of assembling all three. Buying oil alone is up to about 55% less for the same composition, and a 300ml will keep one vessel going for something like eight to eleven months, a 500ml for fourteen to eighteen. If you have settled on a scent and a room, the refill is simply the sensible way to buy it.
The gap sits in the middle of that arrangement, and it is ours to own. Refill economics assume you have serviceable reeds, and we do not sell serviceable reeds. So the honest arithmetic for a long-term customer looks like this: buy a 50ml or 130ml bottle occasionally — for the fibre as much as the oil — and run refills in between; or source plain undyed reeds from a craft or packaging supplier and pair them with refills indefinitely. Both are reasonable. What is not reasonable is the third option people take by default, which is to buy refill after refill and never change the fibre, and then to write to me wondering why the fragrance seems to have weakened over the years. It has not weakened. The path has narrowed.
The method itself takes two minutes and rewards a little care. Stand the vessel on a tray, because reed oil marks wood and stone and does not come out. Lift the reeds out and rest them on something disposable. Pour the oil to the neck rather than to the brim — the neck is where the geometry is designed to work, and overfilling makes oil creep down the outside of the glass. Return the reeds, then flip them once, straight away, so both ends are coated; skipping that is why a refill sometimes seems slow to start. Then leave it alone for a few days. There will be a small spike as the dry ends saturate and the top notes leave, a settle over the following week or two, and then the plateau that is the actual product. Judging a refill on day two is judging the spike.
New oil through old reeds is not a refill. It is a bottle you have paid to look at.
— Sonal Sahani, SOSA
Part four — what actually happens, by reed age
This is the table I would want before spending ₹2,399. Find the age of your reeds, read across, and note that the last column is the only thing you have to act on. Timings assume six fibre reeds in an ordinary Indian room; ten reeds or a hot month will bring everything forward.
Refill outcomes by reed age
Same oil, five different results
| Age of your reeds | Wet line 48 hours after refilling | How the room reads | Oil used in month one | What I would do |
|---|---|---|---|---|
| Under 2 months, supple ★ | Climbs promptly and sits high | Spike, settle, then a full plateau | Normal for the size | Reuse them — this is the design |
| 2–3 months, slightly darkened | Climbs, but more slowly than it used to | Slightly flatter than a new bottle | A little under normal | Reuse once, then refresh the fibre |
| 3–4 months, dark, still supple | Rises partway and stalls | Base-heavy, top notes missing | Noticeably reduced | Refresh the reeds now; keep the oil |
| Beyond 4 months, stiff and tacky | Barely moves at all | Quiet, and a flip changes nothing | Very little — the level looks frozen | Fresh fibre before you pour anything |
| Any age, but changing fragrance | Climbs normally | A muddled third smell for 2–4 weeks | Normal, but you will not enjoy it | Fresh fibre regardless of age |
Honest notes for buyers: SOSA refills are oil only — 300ml ₹2,399 for roughly 8–11 months, 500ml ₹3,499 for roughly 14–18 months, about ₹7–8 per millilitre against ₹15–17 for a 50ml bottle — and you reuse your own glass vessel and reeds. Replacement reeds are not sold as a separate product; six fibre reeds arrive with every new bottle (50ml from ₹749, 130ml from ₹1,249) and plain undyed reeds from a craft or packaging supplier are a reasonable in-between. Our guidance is to refresh reeds every few months. Refill method: remove the reeds, pour to the neck, return them, flip once so both ends are coated. Compositions are alcohol-free, phthalate-free, paraben-free, low-VOC and IFRA-compliant on a heat-stable coconut-derived CCT base, tested through 45°C heat and 85% humidity. 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 and keep it away from children and pets. Composed and handmade in small batches in Pune, and a portion of every order supports girl-child education through Nanhi Kali.
Where a bottle earns its keep
SOSA Evening Calm · Kashmir lavender & chamomile ₹799 / 50ml
If your reeds are due at the same time as your oil, a bottle is the cleaner purchase — it brings six fresh fibre reeds, a refillable glass vessel and 50ml of oil for 6–8 weeks, after which the refill takes over. Evening Calm is the softest composition we make at 8.9 on SOSA's internal scale at six reeds, built for bedrooms, nurseries and reading corners rather than for announcing itself. Buy the bottle for the fibre, and let the ₹2,399 refill do the rest of the year. 130ml ₹1,299 for 14–18 weeks.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
We built the refill because throwing away a good glass bottle every seven weeks offended me, and because the price of fragrance in India is inflated by packaging far more than most people realise. Oil alone, at roughly half the per-millilitre cost, is the version of this product I would want to buy myself, and a great many customers now run one vessel for a year or more.
What I did not anticipate was how many people would refill faithfully and never once change the reeds. It makes complete sense in hindsight — the reeds are not what you bought, they are not what ran out, and nothing about them looks urgent. But it means a slow decline that gets blamed on the fragrance, and I have spent a lot of correspondence explaining that the composition in the ₹2,399 bottle is identical to the one in the ₹849 one.
The right response would be to sell you a packet of six fibre reeds for a small sum, and we do not, which is a gap I am not proud of. Until it is closed: buy a bottle now and then for the fibre, or take plain reeds from a craft supplier, and refresh every few months either way. 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
Should I use new reeds when refilling a SOSA reed diffuser?
Use your existing reeds if they are under about two months old, still supple, and a flip still lifts the room — that is exactly what the oil-only refill assumes. Use fresh fibre if the reeds are dark and tacky, stiff, crusted at the neck, or if a flip produces nothing within a day. Also use fresh fibre whenever you are changing fragrance, regardless of reed age.
Does the SOSA refill include reeds?
No. The refill is oil only — 300ml ₹2,399 or 500ml ₹3,499 — and you reuse your own glass vessel and reeds. We do not sell replacement reeds as a separate product either, which is a genuine gap in the range. Six fibre reeds come with every new bottle, and plain reeds from a craft or packaging supplier work in between.
How often should I change the reeds if I refill regularly?
Every few months as a working rule, which for most people means every second or third 50ml or roughly with each 130ml. Bring it forward if you run nine or ten reeds, if the bottle sits in a dusty or high-traffic spot, or after a monsoon. Bring it back if you run four reeds in a cool, sealed bedroom. The reed's clock is not the oil's clock.
How do I actually refill the bottle?
Stand the vessel on a tray, put gloves on, and lift the reeds out onto something disposable. Pour the oil to the neck rather than the brim — overfilling makes oil creep down the outside of the glass. Return the reeds and flip them once immediately so both ends are coated. Then leave it: expect a short spike, a settle over one to two weeks, and a plateau that holds to the end.
Is the refill weaker than a new bottle?
No — it is the same composition on the same heat-stable CCT base, in the same five scents. If a refill reads weaker than the bottle did, the difference is nearly always in the fibre rather than the oil: the bottle arrived with six new reeds and the refill arrived through reeds that had already run a bottle or two. Check the wet line and the pinch test before blaming the fragrance.
Refilling & reed life · 2027
Refill the oil. Refresh the fibre. They are not the same appointment
Oil-only refills at ₹2,399 for 300ml (about 8–11 months) and ₹3,499 for 500ml (14–18 months), roughly ₹7–8 per millilitre against ₹15–17 for a 50ml bottle. Bottles from ₹749 for 50ml and ₹1,249 for 130ml, each with six fibre reeds in a refillable glass vessel. Replacement reeds are not sold separately; refresh them every few months. Free shipping above ₹499, and a portion of every order supports girl-child education through Nanhi Kali.
Shop the refills → Bottles from ₹749
Continue the read
More on reed condition and replacement
- How do you know when reeds need replacing? — the five signs, in the order they appear.
- How often should you replace reeds? — the schedule, and what moves it.
- Can you reuse reeds with a new fragrance? and can reeds clog? — the two reasons to start fresh.
- The complete reed replacement guide — this page and the eight around it, 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 whether to fit fresh reeds when refilling a reed diffuser. Reed-life intervals, wet-line readings and per-millilitre comparisons are SOSA's own working guidance from in-house testing and customer correspondence, not laboratory measurements; results vary with reed count, room conditions, dust load and season. Strength ratings are positions on SOSA's internal scale at six reeds, not an industry standard. Refills are oil only and replacement reeds are not sold as a separate SOSA product.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.