A Story from the Field: The Morning Nurse Orn Had to Decide Whether to Reopen

A mid-sized private dialysis center sits a short drive from the Pa Sak River in Mueang Phra Nakhon Si Ayutthaya district. During the floods of late September and early October 2026, water rose to about mid-shin on the ground floor, which holds the reception hall, the patient waiting room and the storeroom for consumables. The team managed to carry the dialysis machines and medical supplies upstairs in time, and the patients were temporarily referred to other units for their sessions.

Orn, the center's head nurse, came back on the first morning after the water receded. The moment she pushed open the glass door, a heavy, damp smell mixed with river mud rolled out to meet her. A thin film of silt covered the floor. A brown tide line ran along the bottom of every wall. The upholstered chairs in the waiting room had started to sprout grey-green spots of mold, and under the reception counter there was a sour, rotten smell strong enough that she had to cover her nose.

Her phone did not stop ringing. Relatives of patients kept asking the same thing: "When can we come back to dialyze here?" Traveling to a more distant unit two or three times a week is exhausting for people who are already unwell, and for the family members who drive them. Yet Orn knew something the callers might not fully appreciate. Many of her patients have weakened immune systems. A large share also live with diabetes. Some carry chronic wounds on their feet. If the center reopened too early, while the building was still full of bacteria and mold spores, the risk would land squarely on the most vulnerable people in the community.

So her question was never just "Can we wash the floor and open?" It was "How do we know this space is truly safe enough for our patients?" That question is what led the center to contact the team at World Health Disinfection (WHD) to plan disinfection fogging and ozone treatment before reopening its doors.

This article walks through the thinking behind that decision. It is written for clinic owners, head nurses, practice managers and facility staff in Ayutthaya and the surrounding districts who are facing the same choice right now, as the 2026 floodwaters drain away and the pressure to reopen builds every day.

Why Dialysis Centers and Specialist Clinics Need a Higher Standard Than Ordinary Buildings

Any home that has been flooded carries health risks. But a healthcare facility that serves immunocompromised patients, such as a dialysis center, a chemotherapy clinic, a diabetes clinic, a wound care clinic or a geriatric clinic, operates under very different conditions. Here are the reasons the bar is higher.

1. Patients catch infections more easily and get sicker when they do

People with end-stage chronic kidney disease, cancer patients receiving chemotherapy and elderly people with several chronic conditions often have reduced resistance to infection. A germ that a healthy adult shrugs off can put one of these patients in hospital. Dialysis patients also have a vascular access point, such as a fistula, graft or catheter, that must be kept scrupulously clean. Every surface they touch, every chair they sit in, and every breath of air in the waiting room matters more than it would for the general public.

2. Floodwater carries a wider range of germs than most people expect

Water that has flowed through streets, drains and neighborhoods typically picks up bacteria from sewage, including E. coli, along with Leptospira, the organism behind leptospirosis. When the water drops, those organisms do not simply leave with it. They stay behind in the mud, in grout lines between tiles, on chair legs, under counters and inside the building's own floor drains. A surface that looks clean after a quick mop can still carry a meaningful microbial load, especially in corners and joints where silt collects.

3. Airborne mold is a silent hazard

Gypsum walls, ceiling boards, curtains and upholstered furniture that have soaked up water can start growing mold within a few days in Thailand's warm, humid climate. Mold releases spores into the air, and those spores circulate through the air-conditioning system to every room in the building. For immunocompromised patients, inhaling large quantities of spores can trigger allergies, asthma or more serious respiratory problems than a healthy person would experience. You cannot always see the problem, but sensitive patients will often feel it.

4. Patient and family confidence is everything

Relatives who bring a loved one for dialysis notice everything: the smell of the waiting room, the stains on the walls, the cleanliness of the restroom. If they catch a musty odor or spot a patch of mold, their trust can evaporate instantly. Dialysis is a long-term relationship, often several sessions a week for years. Families who lose confidence may move their loved one to another provider permanently, and they will talk about why.

5. Every day closed costs twice

For each day the center stays shut, it loses revenue, staff schedules are disrupted, and patients must travel farther for treatment that cannot be skipped. On the other hand, reopening too early, without properly restoring the space, risks both patient health and the clinic's reputation. A clear, structured plan is what lets a clinic reopen both quickly and safely, rather than having to choose one over the other.

6. Staff need a safe workplace too

Nurses, technicians and administrative staff spend long shifts inside the building. Many of them also went home to flooded houses of their own. A workplace that still smells of mud and mold adds stress and health risk to people who are already stretched thin. Restoring the clinic properly is also an act of care for the team that keeps it running.

The Usual Fixes, and Why They Are Not Enough on Their Own

Most clinics do their best with the tools at hand after a flood. These efforts are valuable, but each has limits that matter more in a healthcare setting.

Washing with bleach alone. Bleach is useful on smooth surfaces once the mud has been removed. However, if mud or other organic matter remains, its effectiveness drops sharply. It also cannot reach deep corners, the undersides of furniture, or the air inside the room. On top of that, a strong chlorine smell can make odor-sensitive patients feel unwell, and repeated heavy use can damage some finishes and fittings.

Running fans and air conditioning to dry the space. This helps reduce humidity to some extent. But if you switch on the air conditioning while the cooling coil and ducts are still contaminated, you may end up blowing mold spores throughout the building. The system that is meant to make patients comfortable becomes a delivery mechanism for the very thing you are trying to remove.

Spraying air fresheners. Fragrance masks odor for a short while, but it does nothing about the source of the smell or the germs. Some fragrances also trigger allergic reactions in sensitive patients. When the scent fades, the musty odor comes right back, often within the same day.

Painting over mold stains. A fresh coat of paint makes the wall look new. But if the inner layers are still damp and moldy, the stains will reappear within weeks, and patients will keep breathing in the spores that escape in the meantime. Painting too early can also trap moisture behind the new coat and make the problem worse.

Waiting for things to dry naturally. In a humid river city like Ayutthaya during the rainy season, natural drying can take weeks. Meanwhile, mold has every opportunity to establish itself in hidden places.

What a dialysis center needs is not just a space that looks clean. It needs a step-by-step process that deals with surfaces, hidden corners and the air together, and that works alongside the facility's own infection prevention and control standards rather than replacing them.

The Solution: Chemgene HLD4H Disinfection Fogging Plus Ozone Treatment by WHD

WHD provides a professional disinfection fogging service using Chemgene HLD4H, applied through ULV (ultra-low volume) foggers. ULV equipment produces a very fine mist that drifts into corners, under beds and chairs, behind cabinets and onto surfaces that hands and mops cannot easily reach. This is followed by our ozone treatment service. Ozone is a gas, so it spreads throughout the closed room, helping to reduce mold spores and break down the odor molecules that have soaked into materials such as fabric, wood and porous wall finishes.

The two steps complement each other. Fogging targets the surfaces where floodwater left bacteria behind. Ozone targets the air and the hard-to-reach pores of materials where mold spores and odor compounds hide. Used together, after proper mud removal, they give a clinic a much stronger starting point than any single method.

One point deserves emphasis. WHD's service is an add-on to the infection prevention system a clinic already has. It does not replace the facility's own protocols or the specialist care of medical equipment. Dialysis water treatment systems and the dialysis machines themselves should be inspected and validated by biomedical engineers and the equipment manufacturers, following the center's own procedures. Our role is to restore the building environment so that those protocols can work as intended.

Our step-by-step process for dialysis centers and clinics

1. Site survey. Our team walks the building with the head nurse or center manager and maps each zone: reception, waiting room, treatment area, storeroom, restrooms and staff rooms. We note where water entered, how high it rose, and where mold is already visible or likely to be hiding.
2. Advice on removal and mud clean-up. We recommend removing items that should be discarded, such as soaked cardboard boxes, curtains and cushions that sat in water for a long time, and washing mud off surfaces before treatment. Disinfectants work best on surfaces that are already physically clean, so this step is essential.
3. Protecting sensitive equipment. Medical devices, delicate electronics, records and medical supplies are moved out of the treatment zone or covered securely, according to the center's own instructions. We agree on this list with your team before any work begins.
4. Disinfection fogging with Chemgene HLD4H. We fog every zone with a fine ULV mist, focusing on floors, wall bases, chair and table legs, counters, handrails, door handles and restrooms, the places floodwater touched and people touch most.
5. Closed-room ozone shock treatment. Using a Master Ozone Generator, we run a controlled ozone dose sized to each room. No people, pets or plants may be inside during treatment.
6. Ventilation. Doors, windows or the ventilation system are opened so that the ozone breaks down back into oxygen. Our team tells your staff exactly when it is safe to re-enter.
7. Re-check and advice. We walk the site again to check odor and visible mold spots, then advise on humidity control and day-to-day cleaning so the problem does not creep back in the weeks after reopening.

10 Reasons Ayutthaya Dialysis Centers Choose WHD for Disinfection and Ozone Treatment

1. A recognized hygiene-grade disinfectant. We use Chemgene HLD4H, a disinfectant used in hygiene-critical settings, well suited to spaces that demand a high level of cleanliness.
2. ULV mist reaches where wiping cannot. The fine mist gets under dialysis chairs, behind storage cabinets and into the joints of furniture.
3. Ozone reduces airborne mold spores. Our ozone treatment addresses the air itself, which is critical for immunocompromised patients.
4. Odor is removed at the source. Musty and mud smells are broken down rather than covered with perfume, so the waiting room smells like nothing at all.
5. Zone-by-zone planning. Work can be scheduled outside service hours and planned by floor or by zone, so patient care in other areas is not disrupted.
6. Respect for your infection control protocols. We fit into your existing procedures rather than asking you to change them.
7. Care for medical and electronic equipment. Covering, removal and controlled ozone dosing protect sensitive devices.
8. A clear ventilation and re-entry plan. Staff know exactly when it is safe to return, with no guesswork.
9. Something concrete to tell patients and families. You can explain that the space has been systematically restored, which supports trust when you reopen.
10. Ongoing support. Keep high-touch surfaces clean day to day with Chemgene HLD4H 750 ml spray, and add our mosquito spraying service around the building if standing water remains nearby.

Before and After Restoration

In Our Client's Words

"At first we thought we could just wash the floor and open. But when the team surveyed the building with us, we saw places we had never thought about, under the counter and behind the storage cabinets. After the fogging and ozone treatment, the smell in the waiting room was dramatically lower. When families came back, nobody commented on the smell. We felt much more at ease."

Head nurse, private dialysis center, Mueang Ayutthaya (illustrative scenario from the field)

A Reopening Checklist for Dialysis Centers and Clinics

Every facility is different, but this checklist covers the steps most clinics in flood-affected parts of Ayutthaya should think through before welcoming patients back.

• Remove all mud from floors and walls in every zone, including the building's internal floor drains and drain covers.
• Discard porous materials that soaked for a long time: cardboard boxes, curtains, cushions and mats that show mold.
• Have an electrician and an air-conditioning technician inspect the electrical system and clean the cooling coils and ducts before you switch the air conditioning back on.
• Ask your biomedical engineers to inspect medical devices and the dialysis water system according to the center's procedures, and document the results.
• Carry out disinfection fogging and ozone treatment, then ventilate fully before staff return.
• Monitor odor and humidity for one to two weeks after reopening. A small hygrometer in each room is an inexpensive early-warning tool.
• Tell patients and families what you have done. A short notice at reception or a message to families explaining the steps builds confidence.

Many patients and their relatives also live in homes that were flooded. Remind them to wear rubber boots and gloves when cleaning up. If they develop a fever, calf pain or an inflamed wound after wading through floodwater, they should see a doctor promptly and mention that they were exposed to floodwater. Leptospirosis responds well to treatment when it is caught early. For general guidance, families can consult the Department of Disease Control.

Beyond Dialysis: Other Specialist Clinics That Face the Same Risks

Although this article centers on a dialysis unit, the same reasoning applies to many other healthcare settings in Mueang Ayutthaya, Bang Pa-in, Phra Nakhon Si Ayutthaya's riverside communities and nearby districts:

• Oncology and chemotherapy clinics, where patients may have very low white blood cell counts during treatment.
• Diabetes and wound care clinics, where open wounds and reduced circulation make infection a constant concern.
• Dental clinics, where aerosols and close contact already demand strict hygiene.
• Physical therapy and rehabilitation centers, with mats, cushions and equipment that absorb moisture.
• Elderly day-care centers and private nursing facilities, where residents may have several chronic conditions at once.

In each case, the approach is the same: remove what cannot be saved, clean physically, disinfect surfaces, treat the air, ventilate, and keep watching for moisture. The details of the plan, which rooms first, what equipment to cover and when to schedule the work, are adjusted to each site during the survey.

Frequently Asked Questions

Q: How long does a dialysis center need to close for disinfection fogging?
A: It depends on the size of the facility and the extent of the damage. Our team will give you an estimate after the survey, and we can plan the work zone by zone or outside service hours to minimize disruption.

Q: Is ozone treatment dangerous for patients?
A: Concentrated ozone is harmful to breathe, which is why treatment is carried out only in unoccupied rooms. The space must be ventilated for the full time our team specifies before anyone re-enters. Once ventilated, ozone breaks down into oxygen.

Q: Will dialysis machines and medical devices be damaged?
A: We ask for sensitive equipment to be moved out or securely covered, and we use a controlled ozone dose. Inspection of the machines and the dialysis water system should be done by biomedical engineers following your center's procedures.

Q: Can this service replace our standard healthcare cleaning protocol?
A: No. It is an additional step to restore the building after a flood. Your center should continue following its own infection prevention and control guidelines as usual.

Q: Do walls with heavy mold need to be removed?
A: If materials such as gypsum board soaked for a long time and have become soft or crumbly, they should be removed and replaced. Fogging and ozone treatment then deal with the remaining structure. Our team will advise you on site.

Q: Do you serve other types of clinics in Ayutthaya?
A: Yes. We work with specialist clinics, dental clinics, physiotherapy clinics and elderly care centers in Mueang Ayutthaya, neighboring districts and other provinces. Call 065-556-6294 or message LINE @whd268 to ask about your area.

Q: What should we do while we wait for the service?
A: Remove mud, discard soaked porous items, keep doors and windows open where security allows, and avoid switching on air conditioning until the system has been cleaned.

Reopen with Confidence, for the Patients Who Are Waiting for You

Dialysis centers and clinics in Mueang Ayutthaya can book a site survey with the WHD team today.

See Our Disinfection Service, Click Here

Book Ozone Treatment, Click Here

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

Related Links

• Ozone treatment for odors and chemical residue
• Chemgene HLD4H disinfectant
• Master Ozone Generator
• All articles

Health references: World Health Organization (WHO): Floods · Department of Disease Control, Thailand