A Typical Scenario: The Back-of-Shop Stockroom Nobody Checked for Days

(An illustrative example case, not a verified customer review.)

Ann runs a stationery and office-supply shop in a three-storey shophouse in Wong Sawang. Behind the shop on the ground floor is her stockroom: steel shelves stacked almost to the ceiling with cartons, reams of paper, files and goods in paper packaging. On the night of 25 September, as heavy rain kept falling, water from the drain behind the building welled up through the floor channel and spread across the stockroom in a thin layer. It was not deep, but it was enough for the bottom row of cartons to wick water up several centimetres.

Busy keeping the shop and her home going, Ann did not properly deal with the stockroom until several days later. By then the musty smell made her hold her breath. The bottom cartons had collapsed, paper reams had swollen into waves, fluffy white mold sat on box corners, and small black spots climbed the concrete wall from the floor. More worrying, cartons on the second and third rows that never touched water had started to smell too.

The staff helping her move stock began sneezing and rubbing their noses. A regular customer who had ordered a box of paper called back to say it smelled musty. Ann propped open the back door and ran an industrial fan all day, sprayed air freshener and set out charcoal odour absorbers on the shelves. The smell eased during the day, but after the room was closed overnight it was back by morning.

This happens in many warehouses and storerooms after heavy rain, whether the water was deep or shallow. Storage spaces are usually closed, poorly ventilated and full of paper and wood that soak up moisture. When dampness lingers beyond a day or two, mold starts to grow and the smell spreads to everything in the room. The answer is to sort, clean, dry and then disinfect and deodorise the whole space systematically.

The Water Situation in Bang Sue in 2026, and Why Ozone for Warehouses and Storerooms Matters

Here is only what has been reported, with source and date. For Bang Sue, the available reports cover canal levels and the assistance-zone declaration; there are no street-by-street or house-by-house flood depth reports. Conditions change daily.

• 27 September 2026: the Bangkok Metropolitan Administration reported that the water level in Khlong Bang Sue had begun to fall (Thai PBS, 27 Sep 2026).
• 29 September 2026: the Department of Disaster Prevention and Mitigation (DDPM) declared two Bang Sue subdistricts, Wong Sawang and Bang Sue, as flood-assistance zones, with the disaster dated from 25 September (Thai PBS, 29 Sep 2026).
• 4 October 2026: Bang Sue was among 22 Bangkok districts with moderate to heavy rain (Siam Rath, 4 Oct 2026).

The citywide picture explains why moisture built up indoors. Thai PBS reported that rain on 25 to 26 September 2026 peaked at 210.0 mm in Chatuchak, Bang Sue's neighbour, with more than 300 mm in about 48 hours; all 50 districts were declared disaster areas on 26 September; and rainfall from 1 to 25 September reached 487 mm against an average of 269 mm. Flooded points in Bangkok rose from 43 on the evening of 25 September to 135 on 27 September, and on 6 October 2026 the DDPM reported 329,000 households affected in Bangkok (Thai PBS; Naewna; Bangkok Biz News).

Bang Sue mixes old communities, shophouses, commercial buildings, warehouses, small factories, wholesalers and homes with ground-floor storerooms. Much of it lies near Khlong Bang Sue and public drainage channels. When rain overwhelms the drains, water often pushes back through floor channels, back doors and low rooms. It may not be the deep flooding seen in some news footage, but for a storeroom, a few centimetres of water plus days of humidity is enough to damage stock and leave the whole room smelling musty.

Where Germs, Mold and Odour Hide in Warehouses and Storerooms After Flooding

A storeroom differs from a living room: people rarely go in, the door is almost always shut, there are few or no windows, and it is packed with absorbent materials. Once moisture gets in, it has nowhere to go. Problem spots include:

• Cartons and product boxes. Corrugated cardboard wicks water higher than you can see, softens, feeds mold and passes musty odour to the goods inside.
• Wooden pallets and shelving. Damp wood grows mold, smells and may start to rot and attract termites.
• Lower walls and concrete floors. Moisture rises into the concrete, leaving white salt deposits and black mold along the old waterline.
• Corners and behind shelves, where air does not move and dust mixed with moisture forms stubborn grime.
• Stored fabrics, cushions, old mattresses and clothing in home storerooms, which absorb the most odour.
• Floor drains and channels. After backflow, leftover sediment releases drain smells from time to time.

Besides mold, drain backflow brings other germs:

• Bacteria such as E. coli and Salmonella from sewage, causing diarrhoea and stomach cramps if they reach hands or containers. Leptospira, the cause of leptospirosis, comes from rat urine, and rats love quiet storerooms with tall stacks of boxes.
• Viruses such as norovirus and rotavirus on surfaces contaminated by wastewater, plus respiratory viruses like RSV and influenza, which spread easily among staff working together in a closed space.
• Mold and spores, which grow quickly when materials stay wet for more than 24 to 48 hours, in line with general WHO and CDC guidance. Moving moldy boxes sends spores into the air.

People working in damp storerooms often report sneezing, congestion, itchy eyes, coughing, a scratchy throat, itchy rashes on hands and arms, and headaches. Older adults, children, pregnant women and anyone with allergies, asthma or weak immunity should avoid handling moldy stock. Anyone with fever, calf pain, diarrhoea or breathing difficulty after flood contact should see a doctor.

What a Musty, Moldy Storeroom Costs You

Stock and money. Goods in cardboard, such as stationery, clothing, shoes, household items and spare parts, absorb musty odour until they cannot be sold or must be discounted. If mold spreads into products, a few damaged boxes become a whole room.

Reputation. Customers who receive smelly goods or moldy boxes assume the shop does not care about quality. They may not return or may leave negative reviews, which hurts longer than the flood itself.

Health of staff and family. Anyone going in and out daily breathes spores repeatedly, allergies flare and sick days rise. In homes where the storeroom is under the stairs or next to a bedroom, the smell spreads to other rooms.

Time and building safety. Checking stock box by box takes days, and repeating it because the smell returns delays deliveries. Lingering damp also rusts steel shelving, rots pallets, and makes low sockets that were once wet a hazard until checked.

Why Fans, Sprays and Charcoal Are Not Enough for a Storeroom

1. Running fans all day. Fans dry surfaces, but while wet cartons remain, moisture keeps evaporating, and fans blow mold spores onto other stock.

2. Air freshener. It masks the smell for a while, but goods end up smelling of perfume mixed with must, which some customers dislike even more.

3. Charcoal or desiccants alone. Useful for keeping a dry room dry, but their capacity is limited in a room full of damp materials, and they do not disinfect.

4. Wiping visible mold and putting stock back. Invisible mold remains in cartons, walls and pallets; back in a closed room, it grows again.

5. Drenching the room in liquid disinfectant. Disinfecting hard, washable surfaces is good, but soaking boxes and goods adds moisture and still misses gaps behind shelves and between cartons.

6. Painting over stains on walls that are still damp, which makes the paint blister and the mold return.

What a storeroom really needs is to remove damaged items, clean surfaces, dry the space, and then disinfect and deodorise the air and every gap at once. That last step is what ozone does well in enclosed spaces like warehouses and storerooms.

How WHD Provides Ozone for Warehouses and Storerooms in Bang Sue, Step by Step

Ozone (O3) is a strongly oxidising gas. Released into a sealed room, it moves into every gap, between cartons, behind shelves, under pallets and into wall cracks. It breaks down the cell structures of viruses, bacteria and mold and breaks apart odour molecules, then reverts to oxygen (O2), leaving no chemical residue on stock. According to the test results the company has had certified by Thailand's Department of Medical Sciences and Intertek (UK), it eliminates viruses, bacteria and mold at 99.99%.

Warehouses and storerooms suit ozone treatment very well because they can be sealed and nobody lives in them. But to be clear: ozone does not dry wet items and does not repair soggy boxes. The right order for Bang Sue storage spaces is:

1. Assess and plan. Contact WHD on 065-556-6294 or LINE @whd268 with the floor area, ceiling height, type of stock, how much water came in and what the smell is like. Photos help. The team plans the sequence and books a date.
2. Sort. Remove cartons and goods soaked by drain water or visibly moldy. Food, medicines and items for mouth or skin contact that touched wastewater should be discarded. Separate important documents for proper document recovery.
3. Clean and dry. Wash floors, lower walls, shelves and floor channels. Open doors and use fans or dehumidifiers until the room is dry. Fix water entry points where possible.
4. Prepare for treatment. All people, pets and plants leave. Stack cartons with gaps between rows so gas can circulate, open box flaps or cabinets as advised, and close doors, windows and vents.
5. Ozone release and contact time. A typical cycle is about 30 minutes per zone; large or high-ceilinged warehouses are split into several zones.
6. Rest and ventilate before re-entry. Allow the ozone to break down and ventilate as the technician advises before staff return.
7. Restock off the floor. Store goods on shelves or pallets raised from the floor, away from walls, and monitor humidity regularly.

WHD's office is in Bang Khae, Bangkok 10160, and we serve the whole of Bangkok, including Bang Sue, by appointment. Queues are long after flooding and we cannot promise same-day arrival, so please contact us in advance. Pricing depends on area and site conditions. Current promotion: a free medical-grade disinfectant spray with any ozone job of 15,000 baht or more. Suitable for stock warehouses, back-of-shop stockrooms, document rooms, home storerooms and small-factory material stores.

Safety rules: ozone is used only in a closed space with no people, pets or plants inside. No entry during treatment; return only after the rest and ventilation period the technician specifies. Ozone does not replace discarding water-damaged items, fixing leaks or medical care.

10 Reasons Bang Sue Shops and Homes Choose Ozone for Storage Spaces

1. It reaches gaps between cartons and behind shelves that cloths and sprays miss.
2. It adds no moisture, unlike soaking the room in liquid disinfectant.
3. It targets many germ groups: bacteria, viruses and mold, at 99.99% per the company's certified test results. See the ozone service
4. It breaks down musty odour on stock and packaging, helping sound goods get back on sale.
5. No chemical residue and no disinfectant smell on products.
6. It is quick: about 30 minutes per zone, and can be booked outside business hours.
7. It protects your shop's reputation by sending customers goods that smell clean.
8. It fits any size, from an under-stair cupboard to a high-ceilinged warehouse. Ask about buildings and warehouses
9. It makes the space more comfortable for staff by cutting the odour and spores that trigger allergies.
10. Easy to plan: 065-556-6294 or LINE @whd268. Book storeroom ozone treatment

Before and After: A Stockroom in Wong Sawang

Note: results depend on site conditions and on how clean and dry the space is. Goods whose material is ruined by mold should be discarded; ozone does not restore damaged items.

Example Case: An Under-Stair Storeroom Near Khlong Bang Sue

(An illustrative example case, not a verified review.)

Oat, an office worker, lives in a townhouse near Khlong Bang Sue with his mother and young child. The space under the stairs holds boxes of old clothes, toys, a spare fan and camping gear. During the late-September downpour, water from the drain out front crept across the floor into that space. Oat swept it out that night but did not open the storeroom again for almost a week.

When he did, the smell made his mother cough, plastic toys had black marks in their seams, and the bottom clothes boxes were moldy. Oat contacted WHD on LINE @whd268. The team advised taking everything out, discarding visibly moldy cardboard and fabric, washing plastic toys with soapy water, washing the floor and walls, and leaving the door open to dry.

On treatment day the family went out for half a day. The team treated the under-stair room together with the ground floor as one zone and the upstairs bedrooms as another, followed by rest and ventilation. Oat said the musty smell he used to notice walking past the stairs was gone, and he switched to lidded plastic boxes on raised shelves as the team suggested.

Checklist for Bang Sue Storage Spaces

Before ozone

• Cut power in rooms that took in water; have an electrician check low sockets and wiring.
• Wear gloves, a mask and closed shoes while moving stock.
• Photograph damaged goods for insurance or assistance claims.
• Discard soaked or moldy cartons, fabrics, food and ruined goods.
• Wash floors, lower walls, shelves and drains; dry within 24 to 48 hours where possible.
• Contact WHD on 065-556-6294 or LINE @whd268.

On the day

• All people, pets and plants out.
• Gaps between stacks; box flaps or cabinets open as advised.
• Doors, windows and vents closed; no entry during treatment.
• Return only after rest and ventilation, when the technician says so.

Afterwards

• Keep stock raised off the floor and away from walls.
• Use lidded plastic boxes for long-term storage.
• Check humidity and smell weekly in the rainy season.
• Seal rat entry points and never store food in the storeroom.
• See a doctor for fever, calf pain, diarrhoea or breathing problems.

FAQ: Ozone for Warehouses and Storerooms in Bang Sue

Q: Do we have to remove all stock before treatment?
A: No. Damaged items must go, but sound, dry stock can stay during treatment. The team will advise on arrangement so the gas reaches everywhere. Tell us in advance about any especially sensitive goods.

Q: Will ozone dry wet cartons?
A: No. Ozone disinfects and removes odour but does not pull moisture out of materials. Dry first with ventilation, fans or dehumidifiers.

Q: Can you treat a large, high-ceilinged warehouse?
A: Yes. The team divides it into zones and schedules around your operations, ideally on a holiday or outside working hours.

Q: Our storeroom is next to a bedroom. Do we need to treat the whole house?
A: It depends on how far the smell has spread. Many families treat the storeroom together with the adjoining rooms. The team will assess how many zones make sense for your home.

Q: We were never deeply flooded, only drain backflow. Is treatment still worth it?
A: Often yes. In Bang Sue many storerooms took in only a few centimetres of backflow, but cardboard wicks water upward and days of humidity let mold spread to dry stock. If the room still smells musty after cleaning and drying, ozone helps deal with the odour and germs left behind.

Q: How long must we stay out?
A: About 30 minutes per zone, plus preparation and the rest and ventilation period. The team gives a clear re-entry time.

Q: What does it cost and how soon can you come?
A: Pricing depends on floor area, ceiling height and site conditions. Call 065-556-6294 or LINE @whd268 for a quote; the team confirms dates in advance based on the current queue.

Get Your Bang Sue Stock and Storerooms Clean and Odour-Free

Talk to WHD about ozone treatment for warehouses and storerooms in Wong Sawang, Bang Sue and along Khlong Bang Sue. We assess, plan and book a date that does not disrupt your sales.

Book Warehouse and Storeroom Ozone

Call 065-556-6294  |  LINE @whd268
Email worldhealthdisinfection@gmail.com

Related Services and References

• Residential and building ozone disinfection
• Ozone cleaning service
• Ozone and chemical residue reduction
• Thai PBS (27 Sep 2026): Khlong Bang Sue level begins to fall
• Thai PBS (29 Sep 2026): DDPM flood-assistance zones in Bangkok
• Siam Rath (4 Oct 2026): 22 districts with moderate to heavy rain
• Thai PBS: Bangkok rainfall 25 to 26 Sep 2026
• Naewna: Bangkok flooded points
• Bangkok Biz News: DDPM households affected in Bangkok
• CDC: Floods and cleanup safety

Note: figures reflect the dates given in news and DDPM reports and change daily.