★ Home odour diagnosis · intermittent drain smell
A drain smell with a timetable is a pressure problem in the stack, not a cleaning problem in your bathroom
A smell that arrives at 7.30am and again at 9pm is following your building's water use, not your bathroom. Those are the hours everyone showers and flushes.
Start here
Your P-trap holds a small plug of water that blocks sewer gas. Pressure surges in the shared stack can push air through that plug or pull the plug out entirely.
The water seal
A blocked or undersized vent stack is the usual root cause. With nowhere to equalise, pressure relieves itself through the nearest water seal — which is yours.
The vent, on the roof
Keep a log for three days: time, which fixture, and whether you heard water in the wall just before. The pattern is normally obvious by day two.
Three days of notes
This is a plumbing job and often a building-level one. It is never a housekeeping failure, and putting fragrance over it removes the signal without fixing the fault.
Call a plumber
Once the seal holds and the smell is gone for a fortnight, two or three reeds from ₹749 give a small bathroom a steady background.
Reeds from ₹749
A smell that arrives at 7.30am and again at 9pm is following your building's water use, not your bathroom. Those are the hours everyone showers and flushes.
Start here
Your P-trap holds a small plug of water that blocks sewer gas. Pressure surges in the shared stack can push air through that plug or pull the plug out entirely.
The water seal
A blocked or undersized vent stack is the usual root cause. With nowhere to equalise, pressure relieves itself through the nearest water seal — which is yours.
The vent, on the roof
Keep a log for three days: time, which fixture, and whether you heard water in the wall just before. The pattern is normally obvious by day two.
Three days of notes
This is a plumbing job and often a building-level one. It is never a housekeeping failure, and putting fragrance over it removes the signal without fixing the fault.
Call a plumber
Once the seal holds and the smell is gone for a fortnight, two or three reeds from ₹749 give a small bathroom a steady background.
Reeds from ₹749
✓ Diagnosis first — if the cause is damp, drainage or a filter, fragrance is not the fix ✓ Reeds from ₹749 for always-on rooms · Sukoon ₹1,899 when you want a switch ✓ Composed by an ISIPCA Versailles-trained perfumer · phthalate-free
Founder Diaries · Why does my home smell like this?
How the timing works: a slug of water falling down a shared stack pushes air ahead of it and pulls a partial vacuum behind it. If the vent cannot relieve that, it relieves through your water seal — bubbling gas up through it, or siphoning it away.
The likely root cause: a blocked, capped or undersized vent terminal, usually at roof level, and usually the society's to fix.
This is plumbing. Do not scent it.
Only after the fixFrom ₹749A large discharge passing your branch connection creates suction behind it and drags the water out of your trap down into the stack. The tell is a distinct gurgle at your floor drain or basin at the moment a neighbour flushes, followed by a smell that then persists rather than passing. The trap is now dry and is not a barrier at all. Short-term, pour a mug of water into every drain in the room to re-establish the seals. Long-term this recurs until the venting is corrected, because the same suction will empty them again tomorrow.
Reeds · always-on roomsFrom ₹749Shop → 
Sukoon · when you want a switch₹1,899Shop → 
Hotel Collection · the scentFrom ₹299Shop →
SOSA products & prices (verified August 2026): Hotel Collection water-based ultrasonic diffuser fragrance 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · Pack of 7 (15ml, all fragrances) ₹1,799; refills 100ml from ₹999. Seven scents: The Ritz-Carlton-inspired (white tea · bergamot · cedar), Westin-inspired (white tea · aloe · cedar), 1 Hotels-inspired (cedarwood · vetiver · green leaves), The St. Regis-inspired (amber · violet · woods), Shangri-La-inspired (jasmine · green tea · white tea), Four Seasons-inspired (citrus · floral · sandalwood), W Hotels-inspired (citrus · pepper · amber). Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499. Water-based, phthalate-free, composed to IFRA standards for home diffusion; 3–6 drops per tank. Made in India, Pune. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; all hotel names are trademarks of their respective owners and are used only to describe the scent style — SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. Prices and availability subject to change — see the live product pages.
Around twenty past seven in the morning, and again somewhere between nine and ten at night. If your bathroom produces a drain smell at roughly those hours and is fine in between, you have already been handed the answer: those are the two windows in which an entire residential building showers and flushes. The smell has a timetable because the pressure in your soil stack has a timetable. Nothing in your bathroom changed between 7am and 7.20am; what changed is how much water was falling past your branch pipe.
Quick answers — read this first
What the seal is: every drain has a U-bend holding a small plug of water. That plug is the only barrier between your bathroom and the waste system.How the timing works: a slug of water falling down a shared stack pushes air ahead of it and pulls a partial vacuum behind it. If the vent cannot relieve that, it relieves through your water seal — bubbling gas up through it, or siphoning it away.
The likely root cause: a blocked, capped or undersized vent terminal, usually at roof level, and usually the society's to fix.
This is plumbing. Do not scent it.
The short answer
Short answer: Because the smell is being driven by pressure in the shared soil stack, and the stack is busiest when the building is busiest. A large discharge from a flat above yours sends a slug of water down the pipe, which pushes air ahead of it and draws air behind it. If that air cannot get in and out through a vent, it forces its way through the nearest water seal instead — which is the trap in your floor or your basin.
How to confirm it: Keep a three-day log of exactly when it happens and where in the room it is strongest. Then test deliberately: fill a bucket and empty it down your own floor trap fast, or run the washing machine, and see whether the smell appears immediately afterwards. Listen at the wall for water moving in the stack just before an episode. A pattern that tracks the building rather than your own use is diagnostic.
Where fragrance fits: Nowhere, until it is fixed. A drain smell is a plumbing signal, not an odour problem, and home fragrance is additive — it adds pleasant molecules and removes nothing, so you end up with both smells and no warning system. Once the seal holds for a fortnight, a reed diffuser from ₹749 at two or three reeds is a good permanent background.
In this guide
Always-on
Reed diffusers · from ₹749
On demand
Sukoon 500ml · ₹1,899
The scent
Hotel Collection · from ₹299
Straight answer
Why does my bathroom smell like drain water only at certain times of the day?
1. Because the stack is busy at those times. Your flat is connected to a vertical soil stack shared with every flat above and below you. When several households discharge at once — the morning shower hour, the evening dinner and bath hour — large volumes of water fall past the point where your bathroom joins the pipe. That moving water drags air with it. The pressure inside the stack rises in front of the slug and drops behind it, and it does so repeatedly for as long as the building is busy.
2. Because that pressure has to go somewhere. A correctly designed drainage system gives it somewhere: a vent pipe that runs up past the highest fixture and terminates in open air, letting the stack breathe. When the vent is blocked, capped over during a waterproofing job, or was never adequate, the pressure equalises through the path of least resistance instead. The path of least resistance is the small plug of water in your P-trap.
3. Because a water seal is only a few centimetres of water. Positive pressure pushes air up through the trap; you get a gurgle and a puff of sewer gas into the room. Negative pressure does the more damaging thing — it pulls the plug of water out of the trap and down the pipe, which is called induced siphonage, and leaves the trap dry and permanently open until something refills it. That is why some episodes are a brief whiff and others become a smell that stays for hours.
4. Because it is very often the floor trap, not the basin. Floor traps in Indian bathrooms are shallow, hold less water than a basin or WC trap, and are the first to be emptied by a pressure event or by simple evaporation. They are also the ones nobody thinks about. When the smell is worst at ankle level and improves if you pour a mug of water into the floor drain, you have found both the fixture and the mechanism.
5. And no, this is not something to fragrance. A drain smell means the barrier between your home and the waste system has failed. It is a signal, and it is a plumbing job — often a building-level one involving the society and the vent terminal on the roof. Scent laid over it gives you a perfumed sewer smell and takes away the only warning you had. Fix it, confirm it stays fixed for a fortnight, then scent the room.
Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
2. Because that pressure has to go somewhere. A correctly designed drainage system gives it somewhere: a vent pipe that runs up past the highest fixture and terminates in open air, letting the stack breathe. When the vent is blocked, capped over during a waterproofing job, or was never adequate, the pressure equalises through the path of least resistance instead. The path of least resistance is the small plug of water in your P-trap.
3. Because a water seal is only a few centimetres of water. Positive pressure pushes air up through the trap; you get a gurgle and a puff of sewer gas into the room. Negative pressure does the more damaging thing — it pulls the plug of water out of the trap and down the pipe, which is called induced siphonage, and leaves the trap dry and permanently open until something refills it. That is why some episodes are a brief whiff and others become a smell that stays for hours.
4. Because it is very often the floor trap, not the basin. Floor traps in Indian bathrooms are shallow, hold less water than a basin or WC trap, and are the first to be emptied by a pressure event or by simple evaporation. They are also the ones nobody thinks about. When the smell is worst at ankle level and improves if you pour a mug of water into the floor drain, you have found both the fixture and the mechanism.
5. And no, this is not something to fragrance. A drain smell means the barrier between your home and the waste system has failed. It is a signal, and it is a plumbing job — often a building-level one involving the society and the vent terminal on the roof. Scent laid over it gives you a perfumed sewer smell and takes away the only warning you had. Fix it, confirm it stays fixed for a fortnight, then scent the room.
Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
TL;DR: a drain smell with a schedule is following the building's water use, not your cleaning. Pressure surges in the shared stack push gas through your water seal or siphon the seal out entirely, usually because the vent cannot relieve them. Log the times, refill the traps, and get the vent looked at. Fragrance has no role until it holds.
Only once the seal holds
SOSA reed diffusers From ₹749
Not yet. Get the trap and the vent sorted first — then a SOSA reed diffuser gives a small bathroom a steady background with no electricity and nothing to switch, at two or three reeds rather than six. 50ml from ₹749 for 6–8 weeks, composed and made in India, in Pune.
Why a household smell can keep a timetable
Most household smells are continuous, because most sources are continuous. A loaded drain, a damp curtain, an old bin — these produce at a steady rate and the room concentration rises and falls only with ventilation. An intermittent smell is therefore diagnostically valuable: something is switching on and off, and in a bathroom there are very few candidates. If it correlates with your own showering, it is probably biofilm being disturbed. If it correlates with the clock rather than with anything you did, the switch is outside your flat. That points at exactly one system: the shared drainage stack and its ventilation.
The physics is unglamorous and worth understanding once. Water falling down a vertical pipe does not fill it; it clings to the wall and falls as an annulus with an air core down the middle, and it drags that air core along with it. Ahead of a large discharge the air is compressed, behind it the air is rarefied. A vent pipe open to the atmosphere lets the stack draw in and expel air freely, so those swings stay small. Without one — or with one that has been blocked by debris, a bird's nest, or a slab poured over it — the stack has to find its air somewhere else, and every trap connected to it becomes a candidate valve. Your bathroom is not producing the smell. Your bathroom is being used as a pressure relief valve by the rest of the building.
Three ways a water seal fails, and how to tell which one you have
1
FAILURE ONE · SIPHONAGE
The seal is pulled out from below
Only after the fixFrom ₹749A large discharge passing your branch connection creates suction behind it and drags the water out of your trap down into the stack. The tell is a distinct gurgle at your floor drain or basin at the moment a neighbour flushes, followed by a smell that then persists rather than passing. The trap is now dry and is not a barrier at all. Short-term, pour a mug of water into every drain in the room to re-establish the seals. Long-term this recurs until the venting is corrected, because the same suction will empty them again tomorrow.
Quick check: pour water in, wait an hour, then pour again. If the second pour makes a hollow splash rather than a soft one, the trap emptied itself in between.
2
FAILURE TWO · BACK-PRESSURE
Gas is pushed up through the seal
The opposite event. Compression ahead of a falling slug of water forces air up your branch and bubbles it through the plug of water in the trap. The seal survives — the trap still has water in it — but a quantity of stack air has just come into your bathroom. This is the version that produces a short, sharp episode: a bubbling noise, a strong smell for a few minutes, then nothing until the next surge. It is the more common of the two in tall buildings and lower flats. Refilling the trap does not help here, because the trap is not empty — the fix is genuinely at the vent, and it is a society-level conversation rather than a plumber-for-an-hour one. In the interim, keep the bathroom door shut and the extract fan running during the two peak hours.
Worth knowing: if your neighbours on other floors report the same thing at the same times, that is close to confirmation. Ask before you spend money.
3
FAILURE THREE · EVAPORATION OR A BROKEN TRAP
The seal was never there at that moment
The dull possibilities, and both are common. A drain that is used rarely — a second bathroom, a utility floor trap, a washing-machine outlet — loses its seal to evaporation over weeks, faster in dry or air-conditioned conditions. It then reads as intermittent only because you notice it when the room is closed and the smell has had time to accumulate. Separately, a trap can be physically compromised: a cracked body, a poor connection at the floor, a bottle trap under a basin that was never fully tightened after some work, or — in older or badly modified bathrooms — a floor outlet with no trap at all, just a grating over an open pipe. A torch and five minutes under the basin will settle the second of these. For the first, a mug of water down every unused drain once a week is the entire cure.
Symptom to cause: reading the timing
The timing and the sound are your two best pieces of evidence here. Match what you actually observe against these rows before you call anyone, because it changes who you need to call — a plumber for your flat, or the society for the stack.
The intermittent-drain table
When it happens, what that means, and who fixes it
| What you notice | Most likely cause | How to confirm it | What actually fixes it |
|---|---|---|---|
| Early morning and mid-evening, most days ★ | Peak building water use surging the shared stack | Log three days of times; ask a neighbour on another floor if they get it too | Vent inspection at roof level. A plumbing and society job, not a cleaning one. |
| A gurgle at your drain, then the smell stays | Induced siphonage — the water seal has been pulled out | Pour water in, wait an hour, pour again and listen for a hollow splash | Refill traps now; correct the venting so they stop emptying |
| A bubble and a sharp whiff, then it passes | Back-pressure pushing stack air up through an intact seal | Note whether the trap still holds water immediately afterwards | The vent, again. Refilling the trap will not help. This is plumbing. |
| Only after you run the washing machine | Your own discharge siphoning a nearby trap, or an unsealed machine outlet | Run a cycle deliberately and stand in the bathroom as it drains | A properly trapped and sealed washing-machine standpipe |
| Worse after the flat has been shut for a few days | Evaporation emptying a rarely-used floor trap or second bathroom | Pour a mug of water in and see whether it clears within the hour | A mug of water down every unused drain weekly; ask someone to do it when you travel |
| Constant, not timed, and more sour than sulphurous | Biofilm inside the waste pipe rather than a seal failure | Smell at the floor trap with the grating lifted out | Brush inside the pipe, hot water and soda, clear the hair catcher weekly |
| If none of these fit: take the grating off your floor trap and look straight down with a torch. If you can see a clear open pipe with no standing water in a bend, there is no seal there at all — either it has been emptied, or that outlet was never trapped. Both are plumbing conversations and neither is your fault. | |||
Shop this guide
Where fragrance comes in — a long way after the plumber
Reeds · always-on roomsFrom ₹749Shop → Sukoon · when you want a switch₹1,899Shop → Hotel Collection · the scentFrom ₹299Shop →
The SOSA principle
A smell that keeps office hours is not your bathroom. It is the building using your trap as a valve.
Which is why the fix is at the vent terminal on the roof, and why nothing you buy in a bottle will change a pressure differential in a pipe.
What to actually do about it, in order
First, gather three days of evidence, because it costs nothing and it changes the conversation. Note the exact times it occurs, which part of the room it is strongest in, whether you heard water moving in the wall in the seconds before, and whether anyone in the flat used water at that moment. Then run two deliberate tests. Empty a full bucket fast down your own floor trap and see whether the smell follows. Run the washing machine and stand in the bathroom while it discharges. Finally, ask one neighbour above and one below whether they get the same thing at the same hours. A pattern shared across floors is close to proof that the problem is the stack.
Second, do the two things you can do yourself. Pour a mug or two of water into every drain in the flat that you do not use daily — floor traps, the second bathroom, the utility outlet — and repeat weekly. That rules evaporation in or out within a day. Then get under the basin with a torch and check the trap is present, sound and tight, and check that any washing-machine hose enters a properly trapped standpipe rather than being pushed into an open floor drain. If the smell disappears after refilling and stays away for a week, your problem was evaporation and you are finished.
Third, if it recurs on schedule, escalate it as a plumbing and building issue rather than trying harder at home. Ask for the vent terminal on the roof to be inspected for blockage — debris, nests, or a slab or waterproofing layer laid over it during maintenance are all common. A plumber may also propose an air admittance valve on the branch, which lets air in to break a vacuum. While it is unresolved, keep the bathroom door closed and the extract fan running through the peak hours so the room is under slight negative pressure and any gas that enters is pulled out rather than into the flat. Do not put fragrance on it at any point in this process. Once the room has been genuinely clear for a fortnight, a reed diffuser from ₹749 at two or three reeds gives it a permanent background, or the Sukoon at ₹1,899 if the bathroom is large or opens onto a dressing area.
The trap in your floor is a few centimetres of water holding back an entire building — and the building keeps borrowing it.
— Sonal Sahani, SOSA
What to do, in order
Steps one to three here are unusually literal: this is one of the few household smells where the correct answer really is a tradesperson. The fourth step is worth having, but only after the third has held.
The order that works
Four steps, and the first one is a plumber
| Step | What to do | When | Cost |
|---|---|---|---|
| 1. Remove the source | Log the times, refill every trap with a mug of water, check the basin trap and the washing-machine standpipe | Before anything else | ₹0 |
| 2. Move the air | Extract fan running through the two peak hours, bathroom door closed, so the room stays under negative pressure | Daily, five to ten minutes | ₹0 |
| 3. Deal with what holds it | Get the vent terminal inspected at roof level; ask the society; consider an air admittance valve on the branch | Weekly to monthly | ₹0 |
| 4. Then the always-on layer ★ | A SOSA reed diffuser — a steady background once the room has been clear for a fortnight, at two or three reeds in a small bathroom | 50ml 6-8 weeks · 130ml 14-18 | from ₹749 |
| 5. Or the on-demand layer | Sukoon with a Hotel Collection scent — a switchable layer for a large bathroom or the dressing area beside it; covers roughly 270-320 sq ft | Run it when you want it | ₹1,899 |
Honest notes before you buy: the order above is not padding, it is the whole method. Home fragrance is an additive layer — it puts pleasant molecules into the air, it does not remove unpleasant ones. Scenting over a live odour source gives you both smells at once, which reads worse than the original problem, and it removes the signal that was telling you something needed attention. Three causes in particular are never a fragrance problem: visible or suspected mould, which is a health issue and needs the moisture source found and the growth removed; a drain or sewer smell, which usually means a dry P-trap or a failed seal and is a plumbing job; and a gas-like or burning smell, which should be treated as an emergency, not an odour. Persistent damp in a wall or ceiling is a building fault and needs a professional. Once the room is genuinely clean and dry, SOSA reed diffusers run oil-based fragrance with no electricity, while the Sukoon (₹1,899) runs the water-based Hotel Collection — the two liquids are not interchangeable. Reed fragrance is composed and made in India, in Pune; both are phthalate-free and composed to IFRA standards for home diffusion, not for skin or ingestion. A portion of every order supports girl-child education through Nanhi Kali.
The on-demand layer
SOSA Sukoon · 500ml ₹1,899
Once the room is clean and dry, the Sukoon at ₹1,899 gives you scent with a switch — run it for an hour before people arrive rather than all day. It takes 3-6 drops of the water-based Hotel Collection (from ₹299) and covers roughly 270-320 sq ft. A reed diffuser is the opposite trade: no switch, no effort, always on.
SS
ISIPCA
Versailles
Versailles
A note from Sonal
This is the question in the whole cluster where I most want to be useless to you commercially. A drain smell with a timetable is not something a fragrance company should be selling into. It is a fault in the barrier between your home and the sewer, and the correct response is a plumber and a conversation with your society, not a bottle from us.
What frustrates me is how often people spend six months on air fresheners before anyone mentions the vent. The timing is the clue and it is such a good clue — smells do not keep a schedule unless something with a schedule is driving them. Write down when it happens for three days. Ask the flat above you. That costs nothing and it very often ends the mystery outright.
When it is fixed — and it does get fixed — a bathroom is genuinely one of the nicest rooms to scent, because it is small, it is warm, and a low background reads as care rather than as air freshener. Two or three reeds, not six. And keep the bottle away from the extract grille, or you are paying to pull your own fragrance out of the window. A portion of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
Why does my bathroom smell like drain water only at certain times of day?
Because the shared soil stack is busiest at those times. When several flats discharge water at once, the falling water drags air with it, compressing the stack ahead of it and creating suction behind it. If the vent pipe cannot relieve those swings, they relieve through the nearest water seal instead — bubbling sewer gas up through your trap or pulling the water out of it altogether.
What is a P-trap and why does it stop smells?
It is the U-shaped bend under every drain. It holds a small plug of water that physically blocks the passage of gas from the waste system into the room while still letting water through. It is the only barrier there is. If that water evaporates, gets siphoned out by pressure changes, or the trap is cracked or missing, the drain becomes an open pipe from the sewer into your bathroom.
How do I confirm the problem is the vent and not my own drain?
Keep a three-day log of times. Then test deliberately: empty a bucket fast down your own floor trap, and run the washing machine, and see whether either reproduces the smell. Listen at the wall for water in the stack just before an episode. Finally ask neighbours on other floors whether they get it at the same hours. A pattern shared across flats points at the stack and its ventilation rather than at anything inside your bathroom.
Can I fix an intermittent drain smell myself?
Partly. Pouring a mug of water down every drain you do not use daily re-establishes seals lost to evaporation, and checking that the basin trap is present and tight and that the washing-machine hose enters a trapped standpipe are both worth doing. But if the smell returns on schedule, the cause is pressure in the stack and the fix is at the vent terminal, usually on the roof. That is a plumber and a society matter.
Should I use an air freshener or diffuser while I wait for the plumber?
No. Fragrance is additive — it adds pleasant molecules and removes nothing — so you get the drain smell and the fragrance together, which reads worse than either alone, and you lose the signal telling you the fault is still live. Run the extract fan through the peak hours and keep the door closed instead. Once the room has been clear for a fortnight, a reed diffuser from ₹749 at two or three reeds is the right permanent layer.
After the plumbing is sorted
Fix the seal first — then the room can have a character
SOSA reed diffusers composed and made in Pune, 50ml from ₹749 for 6–8 weeks with six fibre reeds included, of which two or three belong in a small bathroom. Or the Sukoon at ₹1,899 with a Hotel Collection scent from ₹299 for a larger bathroom. Neither removes an odour and neither will touch a pressure problem in a soil stack. A portion of every order supports girl-child education through Nanhi Kali.
Shop SOSA reed diffusers → See the Sukoon ₹1,899
Continue the read
More on bathroom smells
- The guest bathroom that only smells when unused — the dry trap, and the mug of water.
- Should I use a diffuser on a drain smell? — why the honest answer is no.
- Still smells right after cleaning — the surfaces a cloth never reaches.
- No window, fan works, still musty — the full diagnostic walk-through.
- 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. Odour diagnosis here is general building and household guidance, not a substitute for a plumber, an electrician or a damp specialist where one is needed. Fragrance longevity and coverage figures are SOSA's own for the stated products; the underlying principles — sorption into soft materials, air-change rate and olfactory adaptation — are general.SOSA products & prices (verified August 2026): Hotel Collection water-based ultrasonic diffuser fragrance 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · Pack of 7 (15ml, all fragrances) ₹1,799; refills 100ml from ₹999. Seven scents: The Ritz-Carlton-inspired (white tea · bergamot · cedar), Westin-inspired (white tea · aloe · cedar), 1 Hotels-inspired (cedarwood · vetiver · green leaves), The St. Regis-inspired (amber · violet · woods), Shangri-La-inspired (jasmine · green tea · white tea), Four Seasons-inspired (citrus · floral · sandalwood), W Hotels-inspired (citrus · pepper · amber). Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499. Water-based, phthalate-free, composed to IFRA standards for home diffusion; 3–6 drops per tank. Made in India, Pune. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; all hotel names are trademarks of their respective owners and are used only to describe the scent style — SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. Prices and availability subject to change — see the live product pages.