Important note: This article is general information about restoring a home after a flood. It is not medical advice. Questions about medication, treatment, the use of medical devices and whether a patient can return home should go to the patient's doctor, pharmacist and equipment supplier. If the patient has chest pain or tightness, unusual breathlessness, a severely racing heart or loses consciousness, call 1669 immediately.

A Story from the Field: Mum's Ground-Floor Bedroom, Full of Equipment

Ton lives in an old two-storey townhouse in a soi off Chan Road in Sathorn with his mother, who is 72 and has lived with heart disease for several years. Her doctor has her use an oxygen concentrator at night, and asks her to check her blood pressure and her weight every morning so the numbers can be reviewed at each appointment. Because climbing stairs leaves her breathless, the family moved her bedroom down to the ground floor some time ago.

That small room held everything her routine depends on: the oxygen concentrator beside the bed with its tubing looped over the headboard, an upper-arm blood pressure monitor, a fingertip pulse oximeter, a digital bathroom scale tucked under the table, a pill organizer with morning, noon and evening compartments, a notebook of blood pressure readings, and a floor fan that ran most of the night.

In early October 2026, heavy rain fell for several days in a row. The drains in the soi could not cope, and water pushed into the house to a depth of about 30 centimetres. Ton quickly helped his mother upstairs and carried the oxygen concentrator and the pill organizer up with her. But the scale, a power strip, several cables and a number of other things went under. It was three days before the water drained away.

When it did, the ground-floor bedroom smelled strongly of damp. A clear tide line ran along the lower walls. The mattress, which sat on a low bed frame, was soaked. The power strip had mud in its sockets, and small spots of mold were starting to appear along the edges of the wooden wardrobe. Upstairs, where his mother was staying for now, the room was hot and stuffy; it had never been set up as a patient's room.

Ton wanted his mother back in her own room as soon as possible, but he had a long list of questions. How should the room be disinfected? Can it have an ozone treatment, and what would that do to the oxygen concentrator? Is a scale that sat underwater still accurate? If you are caring for a family member with heart disease in Sathorn, Bang Rak, Yan Nawa or a nearby district, this guide is meant to help you put the work in the right order.

Why a Home with Medical Devices Needs a Special Plan

1. Electrical devices and floodwater: safety comes before cleanliness

An oxygen concentrator, a blood pressure monitor or a power strip that has been in water, or in very high humidity, may be damaged inside in ways you cannot see. Plugging it straight back in risks a short circuit, and the device might also give wrong readings or stop working without obvious warning. Anything the patient relies on every day should be checked by the supplier or an authorized service center before it is used again.

2. Oxygen and ozone are different things, and both must be handled correctly

Families sometimes confuse the oxygen a patient breathes with the ozone used to disinfect a room. Ozone is a gas that irritates the airways at high concentrations, so it may only be used in an empty room. You also would not want an oxygen concentrator drawing in air with a high ozone concentration. For both reasons, every medical device should be moved out of the room before treatment.

3. Mold and musty smells where the patient spends most of the day

Many people with heart disease spend much of their day in the bedroom. Mold spores in the air can trigger allergy symptoms or coughing in some people, and a damp, smelly room makes it harder to rest well. Clean, fresh, dry air is something the family can actually control.

4. Floodwater germs on everyday touch points

Floodwater is often contaminated with sewage and germs such as E. coli, as well as the bacteria that cause leptospirosis. Bed legs, the bedside table, the stair rail, door handles and the floor are all touched often by the patient and the caregiver, so they need to be cleaned and disinfected thoroughly.

5. Medicines and records exposed to damp

Medicines that got wet or sat in a very humid room may have degraded. Do not decide on your own whether they are still safe to take. Bring them to a pharmacist or the hospital that treats the patient and ask about replacements as prescribed. If the blood pressure notebook got wet, photograph every page before you dry it out, so the readings are not lost.

Common Misconceptions in Patients' Homes

• "Wipe the machine dry and switch it back on": Dry on the outside does not mean dry on the inside. Equipment that got wet should be checked by a professional first.
• "Run an ozone treatment through the whole house and leave the oxygen concentrator on": Never do this. Medical devices must be moved out, and nobody may stay in the treated area.
• "Use lots of bleach so the room is really clean": Strong chlorine fumes in a closed room can irritate the airways, and bleach does nothing about moisture trapped in the walls.
• "Spray perfume before Mum comes back": The musty smell will return while moisture remains, and strong fragrance may bother the patient.
• "Paint over the stains": If the wall is not dry, mold will grow back under the paint.

Each of these shortcuts is tempting when you are tired and worried. The trouble is that they either leave the real problem in place or create a new risk for someone whose health is already fragile.

Medical Device Checklist Before Fogging and Ozone Treatment

Before the team arrives, list every item in the patient's room and sort it into three groups. Writing it down takes ten minutes and saves a lot of confusion on the day.

Group 1: Move out of the area before treatment

• The oxygen concentrator, oxygen tubing, and the mask or nasal cannula
• The blood pressure monitor, fingertip pulse oximeter and thermometer
• The pill organizer, all medicines and medical documents
• Phones, tablets and other sensitive electronics
• Potted plants and pets

Group 2: Have the supplier or a technician check before further use

• Every electrical device that was submerged or splashed
• A digital scale that went underwater: replace it or have its accuracy checked, because some patients send these readings to their doctor
• Power strips, cables and wall sockets that were below the water line: have an electrician inspect or replace them

Group 3: Throw away and replace

• Mattresses, pillows and blankets that soaked in floodwater
• Oxygen tubing and other consumables that touched floodwater
• Medicines that got wet, after consulting a pharmacist or doctor

Restoring the Patient's Bedroom: A Step-by-Step Sequence

1. Keep the patient somewhere safe and contact the medical team: Tell the doctor the house flooded and ask about medication and device use in the meantime.
2. Switch off ground-floor power and have an electrician inspect it: Do this before anyone cleans or plugs anything in.
3. Remove mud and discarded items: Wear rubber boots, rubber gloves and a mask while you work.
4. Wash the floor and lower walls: Use clean water and detergent, then ventilate or run a dehumidifier until the room is truly dry.
5. Move medical devices out according to the checklist: Do this before the day the team arrives.
6. Professional disinfection fogging and ozone treatment: Details in the next section.
7. Ventilate, re-check and set the room up again: Bring checked equipment back in, place the oxygen concentrator with the wall clearance its manual recommends, and keep cables off the floor.

Following the steps in this order matters. Fogging a room that is still muddy wastes the disinfectant, and running an ozone treatment before devices are out puts expensive and essential equipment at risk.

Disinfection Fogging and Ozone Treatment from World Health Disinfection

World Health Disinfection (WHD) provides disinfection fogging and ozone treatment for homes after a flood, and puts real effort into planning the job together with patients' families.

Disinfection fogging with CHEMGENE HLD4H

The team uses CHEMGENE HLD4H with an ultra-low-volume (ULV) fogger. The fine droplets reach bed legs, the space under the wardrobe, room corners, the lower walls, door handles and the stair rail, helping to deal with germs on surfaces that floodwater touched.

Ozone treatment for mold and musty odors

After fogging, the team seals the room and runs an ozone treatment. Ozone gas spreads throughout the space, helping to destroy mold spores in the air and on surfaces and breaking down the molecules behind musty smells. The team controls the dose and duration to suit the size of the room.

Safety rules

• No people, pets or plants may be in the area during ozone treatment.
• Every medical device must be moved out first, especially the oxygen concentrator.
• Electronics that cannot be moved, such as a wall-mounted TV or the air conditioner, are covered, and the team uses a controlled ozone dose, because some rubbers and plastics can age faster with long exposure to high ozone levels.
• After treatment, doors and windows must be opened to ventilate for the time the team recommends before devices and the patient return.

How the service works

1. Site survey: water level, mold spots and the list of equipment in the room.
2. Advice on cleaning up, what to discard and which devices to move out.
3. ULV disinfection fogging with CHEMGENE HLD4H.
4. Ozone treatment in the sealed room.
5. Ventilation until the room is ready to use.
6. A final check of the smell and former mold spots.

Why Old Townhouses in Sathorn Stay Damp for So Long

Many of the older townhouses tucked into the sois around Chan Road, Suan Phlu and Sathorn's side streets were built close together, with small windows at the back and very little cross-breeze. The ground floor often sits only slightly above street level, so when the drains back up, water enters easily and leaves slowly. Once it has gone, the brick and plaster of the lower walls keep holding moisture for days or even weeks, especially when the rain keeps coming in the evenings.

That trapped moisture is exactly what mold needs. You may scrub a wall clean on Monday and see faint grey spots again by Friday. Wardrobes pushed tight against the wall, beds with solid bases and boxes stored on the floor all make it worse, because air cannot move behind them. In a patient's bedroom, those hidden damp pockets matter, because the person who sleeps there may spend twelve or more hours a day in that air.

So before any disinfection or ozone treatment, it is worth pulling furniture a hand's width away from the walls, lifting anything stored on the floor and giving the room as much airflow as you safely can. A dehumidifier is a good investment for a patient's room in a flood-prone soi. Professional treatment works best on a room that is already clean and as dry as possible, and it is much easier to keep a room healthy afterwards when the source of the damp has been dealt with.

A Practical Plan for the Day of the Service

For a family caring for a heart patient, the day of the treatment goes far more smoothly with a little planning. Here is a simple way to organize it.

• The evening before: Move every medical device, medicine and document out of the treatment area, following the checklist above. Pack a small bag for the patient with medicines for the day, the pulse oximeter and anything else the doctor has asked them to keep close.
• Where the patient will be: Arrange for the patient to spend the day with a relative, at a friend's home or somewhere comfortable and cool outside the treated area. If they use an oxygen concentrator during the day, make sure it goes with them and that there is a safe socket where they are staying.
• Morning of the service: One family member meets the team, walks them through the rooms and confirms which items were moved and which large appliances are staying and need covering.
• During the service: Nobody stays inside the treated area. The family member can wait outside or leave and return at the time the team gives.
• After the service: Open doors and windows as advised and wait until the ventilation time has passed. Then bring the checked devices back, set them up away from damp walls, and make the bed with fresh linen.
• Return of the patient: Bring the patient home once the room is ready and, where needed, once the doctor has agreed. Keep an eye on how they feel over the first few days and contact the medical team if anything seems unusual.

Having this plan written on one page and shared with siblings or other relatives means nobody has to remember everything alone, which is a real relief for the main caregiver.

10 Reasons Sathorn Families Caring for Heart Patients Trust WHD with the Room

1. The team always asks for a list of medical devices before starting.
2. There is a clear checklist of what to move out before ozone treatment.
3. ULV disinfection fogging reaches room corners and under furniture.
4. CHEMGENE HLD4H is used on high-touch surfaces.
5. Ozone tackles airborne mold spores that wiping cannot reach.
6. Musty smells are removed at the source, without fragrances that might bother the patient.
7. Ozone dose is controlled to protect electrical appliances that cannot be moved.
8. Ventilation time is stated clearly, so the family can plan the day of return.
9. The upstairs room where the patient stayed temporarily can be treated in the same visit with residential ozone disinfection.
10. You get after-care advice on humidity so mold does not return.

Before and After: The Patient's Bedroom

A Caregiver's Voice

"When I called to book, the first thing the team asked was what medical equipment was in the room. They told me to take the oxygen machine and the pill box upstairs before they came, so that was one less thing to worry about. On the day Mum moved back into her room, the musty smell was gone."

- An example scenario from a caregiving family in Sathorn

Looking After the Patient's Room After the Flood

• Keep medical devices and power sockets raised off the floor in case heavy rain returns.
• Prepare an emergency bag with a medication list, copies of medical records and the doctor's phone number, and keep it within reach.
• Wipe door handles, the bedside table and the stair rail regularly with CHEMGENE spray.
• Watch for a returning musty smell or black spots in corners, and deal with them early.
• If dust mites build up in the new mattress or curtains, consider a dust mite removal service.

It is also worth agreeing on a simple plan with the whole family for the next heavy storm: who carries the oxygen concentrator upstairs, who takes the medicines, and where the emergency bag lives. When everyone knows their job, the next flood warning is far less frightening.

Frequently Asked Questions

1. Can a home with an oxygen concentrator have an ozone treatment?

Yes, but the oxygen concentrator and every other medical device must be moved out of the area first, nobody may be in the room during treatment, and the room must be ventilated for the time the team recommends.

2. Can an oxygen concentrator that got wet still be used?

Contact the supplier or service center to have it checked first, and ask the doctor what to use in the meantime. WHD looks after the cleanliness of the room; we do not inspect or repair medical devices.

3. Are medicines that were in the room during the flood still safe?

Do not decide on your own. Take them to a pharmacist or the hospital treating the patient.

4. When can the patient return to the room?

After ventilation as advised by the team, and ideally after checking with the doctor, especially if the patient's condition changed while the house was flooded.

5. Should we treat the whole house or just the patient's room?

It depends on where the water reached. Generally, every room the water entered should be treated, plus the room where the patient stayed temporarily. The team will advise after the survey.

6. How long does it take?

It depends on the size and number of rooms. After the survey, the team gives an estimated time including ventilation.

7. Do you also cover Bang Rak, Yan Nawa and nearby districts?

Yes. WHD serves Sathorn and neighbouring districts such as Bang Rak, Yan Nawa, Bang Kho Laem and Khlong San, as well as other parts of Bangkok and the surrounding provinces. Call or message us on LINE to check the schedule and arrange a site survey.

Get Your Loved One's Room Ready Before They Come Home

Talk to World Health Disinfection about ozone treatment and disinfection fogging for a patient's home after the flood, in Sathorn and across Bangkok.

Book Ozone Treatment - Click Here

View Disinfection Service - Click Here

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

Further Reading

• Residential ozone disinfection
• Ozone treatment for odors and chemical residue
• Master Ozone Generator
• All articles
• External sources: WHO: Floods and health and Thailand Department of Health