A Story From the Field: Two Neighboring Houses on the Phasi Charoen Canal

In a narrow lane beside Khlong Phasi Charoen, two shophouses stand wall to wall. The first belongs to Ton, an air-conditioning technician who is handy with tools. The second belongs to Auntie Daeng, who lives with her primary-school-aged grandson. Floodwater came into both houses to about mid-shin height and stayed for a week. When it receded, both homes were in the same state: mud across the floors, the smell of stagnant water, and walls beginning to show black spots.

Ton decided to do everything himself. He bought several gallons of bleach, borrowed a pressure washer from a friend and spent three full days scrubbing. The walls looked bright and clean. But two weeks later, a musty smell still drifted from behind the cabinets and under the stairs, black spots were reappearing in the corner of the bedroom, and his son had started sneezing every morning.

Auntie Daeng did not have the strength to scrub a whole house. Her nephew came over to help shovel out the mud and carry damaged furniture to the curb. Then she called in a disinfection fogging and ozone treatment team. After the team finished and the house had been ventilated, she moved back in with her grandson. The musty smell was clearly reduced, and two weeks later no new mold spots had appeared.

The point of this story is not that doing it yourself is wrong. It is that post-flood recovery has several parts. Some you can do well and cheaply yourself; others need specialist equipment and disinfectants. This article helps residents of Phasi Charoen, Bang Khae, Nong Khaem and the wider Thonburi side of Bangkok sort out which is which in 2026.

The Risks to Weigh Before You Decide

Health

• Leptospirosis. Wading through mud for days without protective gear increases the risk of infection through cuts on the hands and feet.
• Diarrhea from sewage-borne germs on hands and dishes.
• Skin irritation and infection from long contact with concentrated bleach and mud.
• Mold allergies and asthma. Scrubbing moldy walls without a mask sends spores straight into your airways.
• Toxic fumes from mixing products. Combining bleach with certain toilet cleaners produces dangerous gases.

Money

DIY looks cheaper at first glance. But disinfectants, tools, a dehumidifier and, crucially, repainting when the mold comes back, can add up to a surprising amount. A professional service gives you a clear quote up front. The fair way to compare is to get a quote after a site survey and set it against a realistic DIY budget that includes the risk of doing the job twice.

When you build that DIY budget, be honest about the hidden items. There is the cost of the products themselves, often bought in a hurry at whatever price the local shop is charging after a flood. There are tools and protective equipment you may not already own. There are electricity costs for running fans and dehumidifiers for days. There is the income lost while you are scrubbing instead of working. And there is the cost that only appears a month later: repainting walls where mold has come back, replacing curtains that never lost their smell, or a doctor's visit for a family member whose allergies flared up. None of these show up on the first receipt, but they are all part of the true cost of going it alone.

Time and labor

Most families need to get back to work and get the children back to school. Spending days scrubbing can cost income and health, especially in households with elderly members or without working-age adults to help.

Side-by-Side Comparison: DIY vs WHD

In short: for many homes, the best value is to do what you can yourself (shovel mud, wash floors, sort belongings, dry the house) and then let professionals finish the job with disinfection fogging and ozone treatment.

Understanding What You Are Actually Fighting

To compare DIY and professional treatment fairly, it helps to understand that a flooded house has three different problems, and each one behaves differently.

1. Germs on surfaces

Bacteria and other microbes carried by floodwater settle onto floors, walls, furniture and kitchen surfaces along with the mud. This is the problem most people picture when they think about cleaning, and it is the one that DIY handles best. Removing mud and washing surfaces takes away most of the contamination. What remains tends to hide where hands and mops do not go: under kitchen counters, behind the toilet, along skirting boards, inside cupboards and in the gaps around door frames. That leftover layer is what fogging is designed to reach.

2. Mold, both visible and invisible

The black and green spots you see on walls are only the visible part of mold growth. Behind them, fungal threads may run into plaster, gypsum board and timber, and every colony releases microscopic spores into the air. Scrubbing a spot can make the wall look clean while actually releasing more spores into the room. Meanwhile, spores drift into bedrooms, settle on curtains and wait for the next humid spell. This airborne part of the problem is where DIY methods struggle most and where ozone treatment adds real value.

3. Odor molecules

The musty, sour smell after a flood comes from compounds released by bacteria and mold, and from organic matter in the mud. These molecules soak into porous materials such as plaster, fabric, wood and foam, and are released slowly over weeks. Air fresheners add another smell on top; bleach may temporarily overpower them with the smell of chlorine. Neither removes them. Ozone reacts with many of these odor compounds and breaks them down, which is why a properly treated house smells neutral rather than perfumed.

Once you see the problem in these three layers, the logic of splitting the work becomes clear. Your own effort is ideal for the first layer. Professional fogging finishes the first layer and starts on the second. Ozone tackles the second and third layers together.

A Sample Split-Work Plan for a Two-Storey Shophouse

Here is how the work might be divided in a typical two-storey shophouse along the Phasi Charoen canal, like Ton's or Auntie Daeng's. The timing will vary with the weather and how long the water stayed, but the sequence is what matters.

• Days 1 and 2 (family): switch off the power, put on protective gear, photograph damage, carry out ruined furniture and soaked bedding, and throw away food that touched the water.
• Days 2 and 3 (family, with help from relatives or neighbors): shovel mud while it is still soft, wash floors and the lower parts of walls with clean water and detergent, and clear floor drains.
• Days 3 to 5 (family): open the house up, run fans pointed outward and a dehumidifier in closed rooms, wash and sun-dry curtains and clothes. Have an electrician inspect the wiring.
• Once surfaces are reasonably dry (WHD): site survey, Chemgene fogging of both floors including the stairwell and storeroom, then ozone treatment while the family stays elsewhere, followed by full ventilation.
• The following weeks (family): daily ventilation, weekly checks for mold, wiping high-touch surfaces, and repainting only when walls are completely dry.

In this plan the family does most of the physical labor, which keeps costs down, and the professional team handles the part that needs specialist equipment and safety procedures. It is the combination that gives the result.

Why DIY Alone Often Falls Short

• Bleach disinfects smooth surfaces, but it does not penetrate to mold inside plaster or gypsum, and its fumes are harsh.
• Pressure washing drives moisture into walls and joints, so they dry more slowly and mold returns sooner.
• Fans speed drying but blow spores into other rooms.
• Air fresheners only cover the smell.
• Painting over damp walls lets mold grow under the new paint.

That is exactly why Ton's house looked clean but the smell and mold kept coming back.

There is another factor that people tend to overlook: exhaustion. After a flood, households are usually short of sleep, worried about money and juggling a dozen problems at once. Scrubbing for days on end in that state wears down the immune system just when the house is full of leftover germs. Splitting the work sensibly, and handing the parts that need specialist equipment to professionals, is not only about cleanliness. It protects the physical and mental health of the whole family as well.

What WHD Does That Is Hard to Do Yourself

Ultra-low-volume (ULV) disinfection fogging

Our disinfection fogging service uses CHEMGENE HLD4H, a high-level disinfectant used in healthcare settings. It is delivered as a very fine mist that hangs in the air and settles on every surface. It uses little liquid but covers everything, so it does not re-soak walls that are still drying.

Ozone shock treatment

Our ozone treatment service uses high-output generators such as the Master Ozone Generator. Ozone penetrates every gap, helps destroy airborne mold spores and bacteria, and breaks down musty odors locked into materials. After ventilation, it reverts to oxygen.

The two treatments are designed to work as a pair. Fogging deals with what has settled on surfaces; ozone deals with what is floating in the air and soaked into materials. Doing one without the other leaves part of the problem behind, which is why our team usually recommends both for homes that stood in floodwater for several days.

Our service process

1. Site survey, damage assessment and a quote.
2. Advice on what to do yourself first, such as shoveling mud and discarding damaged items.
3. Chemgene fogging in every room.
4. Ozone treatment sized to the house.
5. Ventilation until it is safe.
6. Re-check and aftercare advice.

How to Split the Work for Best Value

Jobs you can do yourself

• Shovel mud and wash floors with clean water and detergent.
• Remove damaged items, photograph them and keep a list.
• Open the house up for ventilation and dry anything washable.
• Wipe high-touch surfaces with Chemgene HLD4H spray.

Jobs best left to professionals

• Inspecting and repairing electrical systems (an electrician).
• Whole-house disinfection, including hard-to-reach corners.
• Ozone treatment for spores and musty odor.
• Assessing badly damaged walls and structure.

Learn more on our residential ozone disinfection page.

Six Questions to Help You Decide Whether to Call a Professional

Answer the questions below. If you say "yes" to two or more, professional disinfection fogging and ozone treatment is usually better value than doing everything yourself.

1. Did water stand in the house for more than two or three days? The longer the flood, the deeper the moisture goes into walls and floors.
2. Did the water come from drains or canals carrying sewage? Sewage-contaminated water carries far more germs than rainwater.
3. Are there young children, elderly people, pregnant women or people with allergies or asthma in the household? These groups are more sensitive to mold and germs.
4. Have you noticed mold spots or a musty smell even after cleaning? That is a sign the source is still there.
5. Does the house have closed rooms, storerooms or ceiling boards that got wet? These are difficult to clean properly yourself.
6. Does your household lack the time or energy to scrub for several days straight? Pushing through can harm both health and work.

If You Do It Yourself, Do It Safely

For the parts of the job your family takes on, safety matters as much as speed. Nobody wants to fall ill halfway through restoring the house.

• Switch off the main breaker before starting, and have an electrician check it before power goes back on.
• Wear boots, rubber gloves, a mask and eye protection whenever you are shoveling mud or scrubbing moldy walls.
• Cover any cuts with waterproof plasters to reduce the risk of leptospirosis.
• Use products only as labeled, and never mix bleach with toilet cleaners or ammonia.
• Keep doors and windows open while using chemicals, and take regular breaks in fresh air.
• Wash your hands with soap before eating, and change out of work clothes at the end of each day.
• Keep children and elderly relatives away from the work area until the house is clean and dry.

10 Reasons Phasi Charoen Residents Let WHD Finish the Job

1. More thorough than wiping, thanks to fine-mist fogging.
2. Medical-grade disinfectant: Chemgene HLD4H.
3. Tackles mold in the air with ozone treatment.
4. Removes odor at the source rather than masking it.
5. No lingering chlorine smell. See ozone for odors and chemical residue.
6. Less health risk for your family, who do not have to breathe spores and chemicals.
7. Saves time, so you can get back to work and normal life sooner.
8. Less chance of redoing the job, and less spending on a second round of painting and repairs.
9. Mosquito control available. Canal-side homes swarm with mosquitoes after floods; add our mosquito spraying service.
10. Honest advice on what you can do yourself and what is worth paying for.

Before and After

What Homeowners Tell Us (Example Scenario)

"I'm a technician, so I thought I could do it all myself. I scrubbed for three days, but the smell wouldn't go. When I saw the house next door had the team in to fog and do the ozone treatment and the smell was really gone, I called them for the parts I couldn't fix. Now my son sleeps in his room without sneezing. I wish I had split the work like this from the start."

— Shophouse owner by Khlong Phasi Charoen (illustrative scenario based on field work)

Aftercare Once the House Is Restored

• Ventilate every day, especially for the first two to three weeks.
• Run a dehumidifier in bedrooms and stuffy rooms.
• Check the lower walls and the backs of cabinets weekly, and deal with any new mold spot immediately.
• Wait until walls are completely dry before repainting, and consider mold-resistant paint for rooms that stay damp.
• For mattresses and sofas that were not submerged but smell stale, our dust mite removal service can help.
• Tip out containers and remove standing water around canal-side homes to reduce Aedes mosquitoes.

Whichever route you choose, the goal is the same: a home that is not just clean to the eye but healthy to live in. For Ton, Auntie Daeng and thousands of other families along the canals of Thonburi, that means combining their own hard work with the right professional help at the right moment.

Frequently Asked Questions

Q: If I have already cleaned the house thoroughly, do I still need professional disinfection?
A: It depends on the house. If there is still a musty smell, new mold spots, or young children, elderly people or allergy sufferers at home, fogging and ozone treatment handle what DIY cleaning cannot reach.

Q: Can I buy or rent an ozone machine and use it myself?
A: High-output machines must be used correctly, including treatment time, sealing the space and ventilation. Misuse can be dangerous, so please consult our team first.

Q: How much does the service cost?
A: It depends on the size of the area and the extent of the damage. Our team will survey the site and give you a quote before any work begins.

Q: How should I prepare the house before the team arrives?
A: Clear the mud, remove damaged items, and move people, pets, plants and food out of the area.

Q: Can I use bleach alongside the service?
A: You can use it on smooth surfaces according to the label, but never mix it with other products. Rinse with clean water and let surfaces dry before fogging day.

Q: Do you serve Phasi Charoen and nearby districts?
A: Call 065-556-6294 or message LINE @whd268 to check service areas and book a survey.

Do What You Can, Then Let WHD Finish the Job

Residents of Phasi Charoen, Bang Khae, Nong Khaem and Thonburi: book a survey and get a quote today.

View Disinfection Service – Click Here

Book Ozone Treatment – Click Here

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

Related Links

• Residential ozone disinfection
• Ozone for odors and chemical residue
• Dust mite removal service
• All articles

Health reference: World Health Organization (WHO): Floods fact sheet · Thailand Department of Health