A typical scenario (an illustrative situation based on common experiences, not a review from any specific customer)

The quietest morning the market had seen in ten years

A small fresh market in Bueng Kum, on Bangkok's eastern side, usually comes alive at 3 a.m. Pickups deliver vegetables, the pork stalls start butchering, the fish stalls pour ice onto steel trays, the curry vendors set out their pots, and by dawn the aisles fill with neighbours, home cooks, made-to-order restaurant owners and older residents who shop for dinner every morning. Khun Wat has managed the market for almost ten years and knows nearly every stallholder, including Pi Toi, a fishmonger who has sold there since the market had a corrugated tin roof.

In late September 2026 heavy rain fell for days. According to news reports, about 300 mm fell in roughly 48 hours. Water from a nearby canal spilled in overnight. The market floor, lower than the road, sat under nearly half a metre of water. The open drains under the stalls, which normally carry away fish-washing water and pork blood, became channels for sewage pushing back up. Several stalls' freezers were submerged, and crates, baskets, chopping blocks and scales floated among the rubbish.

Three days later the water began to recede. What remained was foul black mud on every stall, the smell of fish and meat rotting in freezers without power, swarms of flies and signs of rats that had climbed onto counters to escape the water. Pi Toi looked at her stall and asked Khun Wat when she could sell again. Khun Wat was thinking about a harder question: how to get the entire market clean at once. If one stall is clean but the next is not, or the drains stay blocked, germs and smells simply circulate back to everyone.

This guide is for market managers, stall owners and vendors in Bangkok's fresh markets and stall-based food courts who need a systematic, market-wide recovery: safety, waste removal, washing, drying and finally disinfection with the medical-grade disinfectant Chemgene HLD4H, always after cleaning.

The late-September 2026 Bangkok floods at a glance

According to news reports, continuous heavy rain from 24 to 27 September 2026 brought about 300 mm to Bangkok in roughly 48 hours. On 26 September the BMA declared all 50 districts a disaster zone. Eastern Bangkok was hit hardest, with Khlong Chan and Bueng Kum mentioned. Governor Chadchart said the canals were full and drainage would take two to three days after the rain stopped. As of 30 September some roads, such as Si Burapha and Lat Phrao, still had 20 to 40 cm of water.

Thai media compared the event with the 2011 floods, and one business report cited a Chamber of Commerce estimate of about 12,300 million baht in damage. For a fresh market, the loss goes beyond discarded stock. The community's food chain is interrupted, and neighbours who depend on the market for affordable fresh food must travel further while roads remain flooded.

A fresh market is both a business and community food infrastructure. Reopening quickly matters, but reopening a market that is not truly clean can cause widespread illness and destroy the trust customers need to come back.

Why fresh markets are a special risk after a flood

Even before a flood, a fresh market concentrates raw food, water, blood, food scraps and crowds. When floodwater enters, sewage from drains, public toilets and waste points mixes with everything and spreads germs across the site. When it recedes, those germs stay in floor mud, drains, under stalls and in porous materials.

Features that make markets riskier than other places

• Open drains under stalls, already lined with fat, meat scraps and fish scales, which floodwater stirs up and receding water clogs with mud.
• Meat and seafood stalls with large chopping blocks, scales, hanging hooks, steel trays and ice in constant contact with raw food.
• Freezers and fridges that lost power, leaking liquid from spoiled food into the floodwater.
• Shared plastic crates and baskets that circulate between stalls and delivery trucks.
• Public toilets and waste points, which may back up and become direct sources of germs.
• Rats, flies and cockroaches that climb onto stalls to escape water and multiply as waste builds up.
• Many people sharing space: vendors, staff, delivery drivers and shoppers carrying germs on hands and shoes.

Illnesses to watch for

Diarrhoea and food poisoning from bacteria such as Salmonella, associated with poultry and eggs, and viruses such as norovirus, which spreads easily via surfaces and hands. Symptoms include nausea, vomiting, diarrhoea and cramps, and older people and young children dehydrate quickly.

Leptospirosis is a high risk in markets after floods because rats are common and vendors and cleaners wade through water and mud. It enters through cuts or soaked skin. Sudden high fever, headache and muscle pain, especially in the calves, after wading means see a doctor at once and mention flood exposure.

Skin and wound infections. Meat and fish vendors often have small cuts from knives, fish bones or splinters of bone, which easily contact mud and sewage during cleanup.

Surface disinfection lowers risk but is not treatment. Anyone who is unwell should see a doctor, and vendors with diarrhoea, vomiting or fever should stop handling food until they recover.

The impact on markets and food stalls

All fresh stock lost. Meat, seafood, vegetables, fruit and cooked food that touched floodwater or sat in freezers without power for long must be discarded. Many small vendors buy stock day to day, so losing it hits working capital directly.

A mountain of organic waste. Spoiled goods must leave the market fast. Left in place, they smell, attract flies and rats, and leak back into the drains.

Repairs and replacements. Freezers, digital scales, water pumps, the market's wiring and large swollen wooden blocks are major costs for owners and tenants alike.

Customer confidence. Shoppers who saw the flooded market on the news or social media may hesitate to return. If it reopens with lingering smells or flies, they will turn to supermarkets or other markets and may not come back.

The manager's burden. The manager must coordinate dozens of tenants, workers, electricians and rubbish trucks, and perhaps the district office, while everyone wants to reopen immediately. Without a central plan, stalls clean in different ways at different times, and one stall's washing can re-soil another.

Why every-stall-for-itself cleaning fails in a fresh market

One stall washes, the next does not. Muddy wash water from dirty stalls runs along the shared drain and splashes onto clean ones, so germs return.

Stalls washed, drains ignored. Silted drains are the market's biggest source of smell and germs. Without clearing them, clean stalls smell again within days.

Strong bleach poured everywhere. It creates harsh fumes in poorly ventilated halls, irritates workers' eyes and airways, can corrode steel counters, meat hooks and scales, and is dangerous if accidentally mixed with toilet cleaners.

Pressure-washing before shovelling. It blasts mud and germs into a spray that settles on higher stalls and can push even more mud into the drains.

Air freshener or deodorising powder. It masks smell for a while, but the source and the germs stay.

Reopening before the floor is dry. Wet, slippery floors put shoppers, especially older ones, at risk of falls, and moisture helps germs grow.

What a market needs is one central plan that every stall follows at the same time and in the same order: top to bottom, upstream to downstream along the drains, ending with disinfection of all surfaces using a product suited to market materials.

Chemgene HLD4H for fresh-market recovery

According to the product information, Chemgene HLD4H is a medical-grade high-level disinfectant made in England, used in hospitals, clinics, laboratories, schools, offices, airports, child and elderly care, and homes.

• Listed against bacteria, Salmonella, fungi, mycobacteria and viruses including norovirus, influenza H1N1, RSV, hand-foot-and-mouth virus and SARS-CoV-2.
• The product page states it kills within 1 minute, shows 99.85% efficacy against COVID-19 and gives residual surface protection for up to 14 days.
• Dilutions of 1:30, 1:50, 1:60, 1:100 and up to 1:200 according to the label purpose, practical for large areas like a market.
• Biodegradable and non-corrosive to stainless steel, aluminium, rubber, plastic and fibreglass.
• The page states it is safe for people, pets and medical equipment when used as directed.
• Tests and approvals listed include Mahidol University, NHS England, ISO 9001:2015, ISO 13485, SGS, Intertek, CE and EN 13727, EN 14348, EN 13624 and EN 14476.

The main materials in a fresh market are steel counters, aluminium trays, meat hooks, plastic crates and baskets, rubber stall mats, tiled floors and drains. A disinfectant that does not corrode them extends the life of equipment used every day. Flexible dilution lets the market budget product for a large area, and biodegradability suits the volume of wash water flowing into the city's drains.

The core rule: shovel out mud and wash first, then apply Chemgene to clean surfaces at the label dilution and contact time. Workers wear gloves and boots, the area stays ventilated, the product is never used on food, and food-contact surfaces are rinsed with clean water where the label requires it.

A seven-step Big Cleaning plan for a fresh market

Step 1: Brief meeting and zoning

The manager calls a short meeting with tenants, sets one cleaning day for everyone, and divides the market into zones such as meat, seafood, produce, cooked food, toilets and waste points. Each zone gets a leader, and everyone agrees shared rules: wash from the upstream end of each drain to the downstream end, and no stall reopens until the market passes a joint inspection.

Step 2: Power off and safety checks

Cut power to zones that flooded. Do not plug in submerged freezers, digital scales or pumps until an electrician has checked them. Check gas cylinders at cooked-food stalls and inspect roofs and stalls for subsidence. Everyone wears thick rubber gloves, boots, a mask and eye protection. Anyone with cuts on hands or feet should cover them with waterproof dressings or take tasks away from the mud.

Step 3: Remove spoiled goods and waste fast

Double-bag spoiled or flood-contaminated goods in heavy-duty bags, tie them tightly and take them to the collection point for the rubbish truck. Never leave them in the market overnight. Discard absorbent items that cannot be cleaned, such as foam boxes, sponges, cloths, swollen or cracked wooden blocks, paper and cardboard.

Step 4: Clear the drains and shovel out mud

Lift drain covers and remove silt, mud and food debris, working from upstream to downstream. Check grease traps and pipes for blockages. This is the dirtiest job and must come before washing stalls, so that wash water can actually drain away instead of backing up.

Step 5: Wash stalls from top to bottom

Wash roof frames and hanging signs that were splashed first, then hooks, shelves, steel counters and rubber mats, and finally floors and drains. Use clean water with detergent and scrub corners, stall legs and tile joints. Bring crates, baskets, trays and mechanical scales to a central washing area and dry them on racks off the floor.

Step 6: Dry

Open the hall to airflow, run industrial fans once the wiring is confirmed safe, squeegee the floors and keep items off wet ground. General public-health advice, including from the CDC, is to clean and dry within 24 to 48 hours to limit mould.

Step 7: Disinfect the whole market with Chemgene, then inspect together

Mix Chemgene at the label dilution in a clearly labelled central tank. Use sprayers or bottles on counters, shelves, hooks, crates, baskets, floors, drains, toilets and waste points, keeping surfaces wet for the contact time. Rinse direct food-contact surfaces such as meat trays and plastic boards with clean water if the label requires. Then zone leaders and the manager walk the market together, confirming no mud, no rotten smell, free-flowing drains and dry floors before announcing reopening.

Disinfection points by stall type

Pork, chicken and beef stalls: steel meat trays, hanging hooks, scales, knife handles, sharpeners and blocks. A large wooden block that was submerged should be scraped, washed and dried completely. If it is swollen, cracked or still smells, replace it, and keep separate boards for each type of raw meat.

Fish and seafood stalls: ice trays, holding tubs, basins and rubber stall mats. Use only fresh ice from a reputable source and make sure meltwater drains away properly.

Vegetable and fruit stalls: baskets, crates, rubber mats and display trays. Clean and disinfect baskets before new produce goes in. Produce that touched floodwater must be thrown away, never washed and resold.

Cooked-food and curry stalls: pots, ladles, curry trays, display cabinets and tables, treated like a kitchen, with cooked-food containers kept strictly separate from raw.

Common areas: toilets, handwashing sinks, stair rails, doors, market trolleys, the central cashier and waste points. Everyone shares these, so disinfect them several times a day in the first period after reopening.

10 reasons fresh markets choose Chemgene HLD4H for flood recovery

1. Medical grade. Per the product information, used in hospitals and laboratories, which suits a high-risk food environment. See Chemgene HLD4H details
2. Covers raw-food germs. Salmonella, bacteria, fungi and norovirus are listed on the product page.
3. Fast acting. Stated to kill within 1 minute, helping a Big Cleaning day finish on time.
4. Safe for steel counters and hooks, as well as aluminium, rubber and plastic, the market's main materials.
5. Economical over large areas. Dilutes up to 1:200 per the label, practical for floors and drains across a market.
6. Lasting protection. Residual protection of up to 14 days is listed, useful while people come and go and roads remain flooded.
7. No harsh fumes when used as directed, easier for workers in halls with limited ventilation.
8. Biodegradable, suited to the large volumes of wash water entering city drains.
9. Multiple certifications. The product information lists Mahidol University, NHS England, SGS, Intertek, CE and several EN standards. View the certifications
10. Helps communicate confidence. A market that can announce a systematic, market-wide clean and disinfection wins shoppers back faster. Order Chemgene HLD4H

Before and after: a market cleaned all at once

Example case: Big Cleaning day at a Bueng Kum market

(An example case to illustrate planning, not a verified review.)

Evening the water recedes. Khun Wat gathers tenants for a short meeting at the market entrance, divides the site into five zones, appoints zone leaders and gets agreement that no stall opens before the joint inspection. An electrician cuts power to the flooded zones.

Day one. Every stall double-bags spoiled goods, and the rubbish truck makes two runs. A work crew clears the drains from upstream to downstream, lifting out dozens of buckets of silt. Pi Toi decides to throw out all her foam fish boxes and switch to hard plastic tubs.

Day two. All zones wash their stalls from top to bottom at the same time. Crates and baskets are washed together in the central yard. Industrial fans start once the electrician confirms the wiring is safe, and the floor dries through the afternoon.

Day three. Chemgene is mixed at the label dilution in a central tank. Each zone sprays and wipes counters, hooks, crates, baskets, floors, drains, toilets and waste points, keeping them wet for the contact time. Meat trays and plastic boards are rinsed with clean water per the label. In the evening the zone leaders inspect together.

Day four. Every stall opens at once. A sign at the entrance tells shoppers the whole market has been cleaned and disinfected, a handwashing point with soap stands at the gate, and common areas are wiped several times a day. Regulars drift back, and some say the market looks cleaner than before the flood.

Khun Wat's summary for his tenants: a market is only clean when every stall is clean at the same time.

Checklist for market managers and stallholders

Before Big Cleaning day

• Meeting held, zones and leaders set, shared rules agreed
• Protective gear, heavy bags, brushes, squeegees, sprayers and enough Chemgene for the whole market ready
• Rubbish truck and electrician booked
• Label read to set dilution and contact time for floors, counters and food-contact surfaces

After disinfection, before reopening

• Joint inspection: no mud, no rotten smell, drains flowing, floors dry
• Wiring, freezers and digital scales checked
• Clean water, reputable ice and handwashing points with soap in place
• Daily disinfection rounds for common areas and toilets scheduled
• Ongoing rat and fly control, and no waste left overnight
• Vendors or workers with fever, diarrhoea, vomiting or calf pain after wading see a doctor and stop handling food

Follow market sanitation and post-flood disease advice from the Department of Health and the Department of Disease Control.

Frequently asked questions

Can one stall clean on its own without waiting for the whole market?
It can, but it works far less well. Drains and common areas are shared, so wash water and germs from neighbouring stalls will reach you. A coordinated clean is better value.

Can Chemgene be used to wash meat, fish or vegetables?
No. Chemgene is for surfaces and equipment only, never directly on food. Food that touched floodwater must be discarded.

Can a pork stall's big wooden block that was submerged be reused?
If it is not swollen or cracked, scrape the surface, wash it and dry it completely before disinfecting per the label. If it is swollen, cracked or still smells, replace it.

How often should we disinfect after reopening?
Common areas, toilets and food-contact surfaces should be cleaned and disinfected daily, especially while surrounding roads remain flooded. Residual protection up to 14 days is listed, but newly soiled surfaces must be cleaned and disinfected again.

A cleaner has a fever after wading. What should we do?
See a doctor at once and mention the floodwater exposure, especially if there is calf pain, as it may be leptospirosis.

Bring your community market back: busy, clean and safe

A fresh market is the heart of a neighbourhood's food. The best recovery happens all at once: clean thoroughly, dry completely, then disinfect with a medical-grade product that will not corrode your stalls and tools.

Order Chemgene HLD4H for Your Market

Phone 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related links

• Chemgene HLD4H medical-grade disinfectant
• Ozone odour and chemical-residue removal
• Disinfection service

References

• 2026 Bangkok floods (Wikipedia)
• Al Jazeera: Disaster zone declared across Bangkok
• CDC: Floods
• WHO fact sheets (food safety)