A Story from the Field: The First Morning the Sermon Hall Was Dry Enough to Walk In

Uncle Sompong is 62 years old and has served as the lay steward of a riverside temple in Ban Paeng Subdistrict, Bang Pa-in, for almost twenty years. He looks after the accounts, organizes merit-making ceremonies and makes sure the monks have what they need. He says he has never seen the water rise this high. The flood reached almost knee height inside the sala, the open-sided sermon hall where villagers gather to listen to Dhamma talks. It swamped the ground floor of the monks' quarters, the dining hall where the morning meal is offered, and the storeroom that holds mats, cushions, curtains and the big cooking pots used for festivals.

On the morning the water finally dropped enough to walk through, Uncle Sompong was the first to push open the heavy doors of the sala. The smell hit him immediately: a thick mix of damp, rot and river mud so strong he had to pull his shirt up over his nose. The old teak floorboards were coated with a film of brown silt. Every pillar carried a sharp tide line marking how high the water had stood. Low on the plastered walls, black and green spots of mold had already started to spread in rings. The stack of woven mats and triangular cushions piled in the corner had swollen with water and gave off an odor no one wanted to get close to.

Within days, the elderly abbot began coughing every morning after returning to sleep in his quarters. A young monk who had waded through the floodwater to carry supplies developed an itchy rash on his legs. Villagers kept calling to ask whether the annual Kathin robe-offering ceremony would go ahead as planned, and Uncle Sompong did not know what to tell them. He understood that bringing hundreds of people, many of them elderly, into a hall that still smelled of mold and mud was not only uncomfortable. It could be a genuine health risk.

This scene is a realistic picture of what many temples in Bang Pa-in and along the rivers of Ayutthaya are facing after the water goes down. In Thai communities, the temple is far more than a place of worship. It is the meeting hall, the school yard, the festival ground and, during floods, often a temporary shelter. As long as the temple is not clean and safe, the whole community struggles to return to normal life.

Why Riverside Temples in Bang Pa-in Are Especially Vulnerable

Bang Pa-in sits on low, flat land where the Chao Phraya, its side channels and countless small canals meet. Many temples were built right on the water's edge centuries ago, because the river was the main road and monks traveled by boat. That history is part of their beauty, but it also means that when the river rises, temples are often among the first buildings to flood and the last to dry out. Their wide, open-sided halls let water and silt sweep straight in. Thick plaster walls and heavy teak beams soak up moisture and release it slowly for weeks. Storerooms tucked under staircases or behind the main hall get very little sunlight or airflow. All of this creates exactly the warm, damp, dark conditions in which mold thrives and odors linger, which is why a deliberate, professional recovery plan makes such a difference.

The Hidden Problems Inside a Temple After the Flood

Floodwater moving through a community is never clean water. It carries sewage from overflowing drains, animal carcasses, household waste, fertilizer and farm chemicals, and the urine of rats that live along riverbanks. When the water retreats, every surface it touched becomes a reservoir of contamination. Temples face several layers of risk at once.

1. Health risks for monks, staff and worshippers

• Leptospirosis. The bacteria behind this disease live in contaminated water and mud and can enter the body through cuts or skin softened by long exposure to water. Monks, lay stewards and volunteers who clean the temple by hand are especially exposed.
• Diarrheal disease and food poisoning. Dining halls and temple kitchens that were submerged may harbor E. coli and other bacteria on tables, utensils and floors. If they are not disinfected thoroughly before cooking resumes, the food offered to monks and shared at ceremonies can make people sick.
• Skin infections. Walking barefoot is a sign of respect in Thai temples. That custom means feet are in direct contact with floors that may still carry bacteria and fungi, increasing the chance of rashes, itching and infections.
• Allergies and asthma triggered by mold. Mold spores floating in the damp air of the sala and the monks' quarters are a powerful trigger for coughing, sneezing, nasal congestion and asthma attacks. Older monks and elderly worshippers are usually the most affected.

2. Damage to heritage objects and temple property

Many temples in Bang Pa-in have old timber buildings, carved preaching chairs, manuscript cabinets, curtains, carpets and ceremonial items with deep spiritual and historical value. Mold growing on wood and fabric slowly eats into the material, leaving stains, flaking paint and softened, weakened timber. The longer it is left, the harder and more expensive the damage becomes to repair.

3. Faith, reputation and community confidence

People come to a temple expecting calm, cleanliness and a sense of peace. When they step into a hall and are met by a musty odor or see mold creeping up the walls, that feeling disappears instantly. Annual events such as Kathin, Loy Krathong or funeral chanting may have to be postponed or scaled down. That affects the temple's income and, just as importantly, its bond with the community it serves.

4. Limited time and hands

Most temples have very few people to do the work. Monks have religious duties to keep. Lay stewards and volunteers also need to rescue their own flooded homes. Cleaning a large sermon hall, several monks' residences and a dining hall with only a handful of people takes a very long time, and the result is rarely thorough.

Why Traditional Clean-Up Methods Are Not Enough for a Temple

Most temples start the recovery with real dedication and good intentions, but the familiar methods usually only solve the problem on the surface.

• Relying on bleach alone. Bleach can disinfect smooth, hard surfaces, but it does not penetrate porous wood. Its fumes are harsh on the lungs, and it can discolor or damage old timber, fabrics and lacquered or gilded decoration. That makes it a poor fit for sacred buildings full of precious objects.
• Running fans and opening windows. Ventilation helps reduce humidity, but it does not kill mold spores. Strong airflow can actually blow spores from one room into another, spreading the problem to residences that were not affected before.
• Burning incense or using air fresheners. A pleasant scent only masks the musty smell for a while. The odor molecules and their source are still there, and the smell returns as soon as the fragrance fades.
• Repainting the walls straight away. Painting over walls that are still damp and still carry mold leads to bubbling and peeling paint, and the mold usually breaks through the new coat within a few months. It wastes both money and effort.
• Scrubbing by hand only. Brushes and cloths cannot reach behind the preaching chair, under manuscript cabinets, into roof cavities or along the joints between floorboards. Those are exactly the places where bacteria and mold hide.

In short, manual cleaning is an essential first step, but it must be followed by disinfection that reaches every surface and by mold and odor control at the level of the air itself. Only then does the result last.

The Solution: WHD Disinfection Fogging Plus Ozone Treatment

WHD approaches post-flood recovery for religious buildings in two complementary stages.

Stage 1: ULV disinfection fogging with Chemgene HLD4H

The team uses CHEMGENE HLD4H, a high-level disinfectant used in healthcare settings, applied through an Ultra Low Volume (ULV) fogging machine. The machine breaks the solution into a very fine mist that drifts through the space and settles on every surface: floors, walls, pillars, ceilings, beneath the preaching chair, behind cabinets and into corners no hand can reach. Because only a small volume of liquid is used, surfaces are not soaked, which makes the method well suited to timber floors and the older materials found in temples.

Stage 2: Ozone shock treatment for mold spores and odors

After fogging, the team seals the area and runs a high-output ozone treatment. Ozone is a strong oxidizing gas. It fills the entire room, reaches into fabrics, mats, curtains and the pores of the wood, and helps destroy mold spores and airborne bacteria while breaking down the molecules responsible for musty, muddy and rotten smells. Once the treatment time is complete, ozone naturally reverts to oxygen and leaves no chemical residue behind.

How the service works for temples and religious sites

1. Site survey. The team arranges a visit to inspect the sermon hall, monks' quarters, dining hall, bathrooms and other buildings. They assess how high the water rose, where mold is present and which materials need special care, then plan the order of work so it does not disrupt the monks' daily routine.
2. Guidance on mud removal and initial cleaning. WHD advises on shoveling out mud, washing floors and sorting out items too damaged to keep, such as mattresses or cushions saturated with polluted water, so that disinfection can work at full effect.
3. Disinfection fogging with Chemgene HLD4H. Every flooded building is fogged, with particular attention to bathrooms and kitchens, which are high-risk zones.
4. Ozone shock treatment. Rooms are closed and treated for a duration matched to their size and the strength of the odor. Buildings are treated one at a time so the monks always have somewhere to rest and practice.
5. Ventilation. Doors and windows are opened so the ozone can dissipate fully before anyone goes back inside.
6. Follow-up check. The team checks odor levels and the condition of the space after treatment and advises on ongoing care, including humidity control and the right time to repaint.

Practical Checklist: What the Temple Can Do Before and After the Service

A professional treatment works best when the temple community plays its part. Based on what we see on site after floods along the Chao Phraya, here is a simple checklist that abbots, lay stewards and volunteers can follow.

Before the team arrives

• Protect the people doing the work. Anyone shoveling mud should wear rubber boots, long gloves and a mask, cover any cuts with waterproof dressings and wash thoroughly with soap afterwards. This is the simplest and most important defense against leptospirosis and skin infections.
• Remove the mud while it is still soft. Silt is much easier to remove before it dries and hardens into the gaps between floorboards. Push it out of the buildings rather than washing it into drains that are already blocked.
• Separate what can be saved. Hard items such as metal bowls, ceramic plates, plastic chairs and lacquered trays can usually be washed and disinfected. Soft, absorbent items such as foam mattresses and stuffed cushions that sat in sewage-contaminated water for days are often better discarded.
• Move sacred objects to a safe, dry place. Small Buddha images, manuscripts and ceremonial items should be wiped gently and kept in a dry, ventilated room. Tell the WHD team which items or areas need special handling.
• Photograph the damage. Pictures of tide lines, mold patches and damaged items help with planning, with requests for support from local authorities and with comparing the before-and-after condition.

After the treatment

• Keep the air moving. Open the sala and the monks' quarters every day during dry hours so humidity can escape. A dehumidifier in enclosed rooms is helpful while the walls are still drying out.
• Watch the old trouble spots. Check the lower walls, the back of cabinets and the corners of the storeroom each week. If a small patch of mold reappears, wipe it with disinfectant straight away rather than waiting.
• Repaint only when the walls are truly dry. Plaster can hold moisture for weeks. Painting too soon simply traps the moisture and invites mold back.
• Clear standing water from the grounds. Old pots, gutters, drums and low spots in the courtyard become mosquito breeding sites within days. Emptying them protects monks and visitors from dengue as well.
• Plan ahead for next season. Keep a small stock of disinfectant, store mats and cushions on raised shelves and agree on a simple flood plan with the community, so recovery is faster next time.

10 Reasons Bang Pa-in Temples Choose WHD for Post-Flood Recovery

1. Disinfection that reaches every corner. The fine mist from our disinfection service gets beneath preaching chairs, behind cabinets and into roof cavities that brushes cannot reach.
2. Healthcare-grade disinfectant. Chemgene HLD4H is designed to act against a broad range of bacteria, viruses and fungi.
3. Gentle on old timber and precious materials. Low-volume fogging does not leave wooden floors or fabrics soaking wet.
4. Odor removed at the source. Ozone treatment breaks down odor molecules instead of covering them up.
5. Fewer airborne mold spores. That means fewer triggers for allergies and asthma among elderly monks and worshippers.
6. No ozone residue. Ozone reverts to oxygen, as explained on our page about ozone for odor and chemical residue removal.
7. Scheduled around monastic life. Work is done building by building, so the temple never has to close completely.
8. Covers every building. Sermon halls, monks' quarters, dining halls, kitchens, bathrooms and storerooms are all included in the plan.
9. Ongoing protection from mosquitoes. If the temple grounds still hold standing water, our mosquito spraying service can be added.
10. Confidence restored to the community. The temple can host ceremonies and welcome visitors again with peace of mind.

Before and After

In the Words of a Temple Steward (Field Scenario)

"At first I thought that once we washed out the mud and left the windows open for a week, the smell would go away. It didn't, and the mold kept spreading every day. When the WHD team came, surveyed everything and then fogged and ozone-treated the buildings one by one, the smell that had been stuck in our noses improved a great deal. The abbot is coughing less, and the villagers who came to help said the hall finally feels comfortable again. That gave us the confidence to go ahead with the Kathin ceremony."
— Uncle Sompong, lay steward of a riverside temple in Ban Paeng, Bang Pa-in (a composite persona based on real situations)

Frequently Asked Questions

Q: Does the temple need to be completely dry before disinfection?
A: Mud should be removed and floors washed first, but every surface does not have to be bone dry. The sooner disinfection happens, the less time mold has to grow. The team will assess the site and recommend the best timing.

Q: Is Chemgene HLD4H safe around Buddha images and old woodwork?
A: Fogging uses only a small amount of solution and does not soak surfaces. For gilded Buddha images, lacquer work or fragile antiques, the team discusses protection or exclusion zones with the temple on a case-by-case basis.

Q: Do monks have to leave their quarters during ozone treatment?
A: Yes. Nobody, no pets and no plants may stay in a room being treated. The team works one building or one room at a time and confirms when it is safe to return after ventilation.

Q: Can ozone treatment help with mats, cushions and curtains?
A: Ozone is very effective at reducing musty odors and surface mold on fabrics. However, items that soaked in polluted water for a long time and are swollen or have mold deep in the filling should be discarded for safety. The team can help you decide what to keep.

Q: What should we do after the service?
A: Keep the buildings well ventilated, control humidity, watch the spots where mold used to appear, and wait until walls are fully dry before repainting. If water is still pooling around the temple, deal with mosquito breeding sites as well.

Q: Do you serve temples in Bang Pa-in and across Ayutthaya?
A: Please call 065-556-6294 or message LINE @whd268 to check service coverage and book a site survey.

Bring Your Temple Back to a Clean, Peaceful Place for the Community

Talk to the WHD team about a disinfection fogging and ozone treatment plan for your sermon hall, monks' quarters and dining hall.

View Disinfection Service – Click Here

Book Ozone Treatment – Click Here

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

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Reference: World Health Organization – Floods fact sheet and Department of Disease Control, Thailand