What Happened: Standing Floodwater on Thoet Racha Road, Don Mueang, 2026 (B.E. 2569)

According to a Daily News (dailynews.co.th) report dated 27 September 2026 (B.E. 2569), floodwater covered the entire length of Thoet Racha Road in Si Kan, Don Mueang district, Bangkok, for a second day. Residents had to drive or wade through the water just to go out and buy food. The main cause was drainage: water from the area flows into the Khu Nai Kim Sai 1 canal and then into Khlong Prem Prachakorn, which was running high at the time, so water drained slowly and in places flowed back. Repeated afternoon rain added to the problem.

For most people, two days of standing water means an awkward commute. For ambulances and rescue vehicles carrying patients from that area, or for delivery trucks working to a schedule, it means driving through contaminated water many times a day, then bringing whatever clings to tyres, wheel arches, underbodies, floors and crew boots back into the depot.

The national figures for 2026 (B.E. 2569) show the scale of the challenge. According to the Department of Disaster Prevention and Mitigation (DDPM), as published by the Government Public Relations Department with data as of 06:00 on 7 October 2026 (B.E. 2569), floods had affected 27 provinces plus Bangkok, 123 districts and 984 subdistricts, with 1,154,875 households and more than 3.1 million people affected. With an affected area that large, every emergency and transport vehicle works harder than usual, and nobody has time to wait.

Example Case: A Rescue Base in Don Mueang After Days in the Water

Note: this is a typical scenario compiled from situations commonly seen at rescue units and vehicle fleets after floods. It is not the account of any specific organisation or person.

Ton is the shift leader at a rescue base in the Don Mueang area. He looks after six rescue and patient-transport vehicles plus two flat-bottomed boats. At the end of September 2026 (B.E. 2569), his team was collecting bedridden patients from flooded homes, taking pregnant women to hospital and carrying relief bags into lanes too narrow for larger trucks. Each vehicle went through water several times a day. Mud built up thickly on tyres and wheel arches, water pooled on floors from crew boots, and stretchers and ropes never dried out.

When the water began to fall, new problems arrived. The garage floor was coated in mud, sediment had built up in the wash bay, the crew rest room smelled musty and used rescue equipment was piled up waiting to be cleaned. Meanwhile the radio kept calling vehicles out. Ton had to choose between taking vehicles off duty for long clean-ups or sending them out without proper disinfection.

The team tried hoses and hand-squeeze spray bottles, vehicle by vehicle. The best they could manage was washing the outside and wiping the stretchers. The garage as a whole, the wheel arches, the underbodies, the equipment racks and the boats were barely disinfected. Two crew members developed sore, macerated feet. Another came down with a fever and calf pain, and Ton sent him to a doctor straight away.

His question was clear: "How do we disinfect the whole base and every vehicle during a shift change without stopping service?" The answer many organisations choose is to keep a high-powered backpack mistblower at the base and set out a clear procedure for which parts are sprayed and which are wiped.

What Germs Do Flood-Driven Vehicles Bring Back?

Standing water on urban roads like those in Don Mueang is a mix of rain, canal water and drain water. When drainage is slow or flows backwards, sewage can rise onto the road surface. Every vehicle that passes picks up that water and mud on tyres, wheel arches, steps and underbodies, and it is carried inside on the boots of everyone who climbs in and out.

The main germ groups to know

• Sewage bacteria such as E. coli and Salmonella, carried in mud and floodwater, which cause diarrhoea and food poisoning if crews eat without washing their hands during a shift.
• Leptospirosis risk from Leptospira bacteria found in standing floodwater and mud. They enter through cuts or skin softened by long immersion, so rescue crews who wade all day are directly exposed.
• Gastrointestinal viruses such as norovirus and rotavirus, which spread on hands, surfaces and shared equipment and can move quickly through a team.
• Respiratory viruses such as influenza and RSV, common in the rainy season. An ambulance is an enclosed space where patients and crew are close together.
• Moulds that grow in floor mats, seats, air-conditioning vents, crew rooms and equipment shelves that stay damp, causing musty smells and irritating the airways.

Why ambulances and rescue vehicles need extra care

Ambulances and rescue vehicles carry frail patients, injured people with open wounds and older adults with chronic illnesses. If floors, steps or equipment still carry flood germs, these patients face greater risk than healthy people. Delivery fleets have a related concern: contaminated cargo areas can pass problems on to the shops and homes receiving the goods.

Guidance from public health bodies such as Thailand's Department of Disease Control and the US CDC is consistent: after a flood, remove mud and dirt, wash, dry, and only then disinfect surfaces. Disinfectants work best on clean surfaces, not on thick mud.

Important: any crew member who develops fever, muscle pain (especially in the calves), red eyes, diarrhoea or infected wounds after wading should see a doctor immediately and mention floodwater exposure. Disinfecting vehicles and depots reduces risk. It is not a treatment.

The Real Pain Points for Fleet Managers After a Flood

1. Vehicles cannot stop for long. Ambulances and rescue trucks must be ready around the clock, and delivery trucks have customers waiting. Every hour in the wash bay is an hour of lost capacity.
2. The area is huge. It is not only the vehicles but the garage, wash bay, driveways, crew rooms, equipment stores and the boats used on missions.
3. Many hidden spaces. Wheel arches, underbodies, steps, cargo-floor grooves and equipment racks are hard to reach thoroughly with hoses and cloths.
4. Exhausted crews. Teams who have been on call all day have no energy left to scrub an entire garage by hand.
5. Team health. If several crew members fall ill at once, capacity drops right when it is most needed.
6. Patient and customer trust. Patients and families expect a clean ambulance. Logistics customers expect uncontaminated goods.
7. Repeat flooding. Areas with slow drainage and backflow, like Don Mueang, can flood again after the next heavy rain, so hiring outside help every time is not fast enough.

Why Hoses and Hand Sprayers Fall Short for Rescue Bases and Fleets

Washing with pressurised water and detergent is always the essential first step. But for the disinfection stage, the usual tools have clear limits.

• Hoses shift mud well, but rinsing is not disinfection, and splashing can spread contamination around the garage.
• Hand-squeeze bottles hold little, cover small spots and need constant refilling. Fine for high-touch points, not for a garage of several hundred square metres or a row of vehicles.
• Manual pump sprayers give uneven pressure and large droplets, with no airflow to carry the spray into wheel arches and under the chassis.
• Wiping by hand is essential inside an ambulance's patient compartment, but using it for garage floors and vehicle exteriors would take far longer than one shift allows.

What a fleet needs is a tool one person can carry, with long reach, enough airflow to push disinfectant into gaps and a tank large enough to keep going, so the job is finished within a shift change.

Meet the SOLO PORT 423 Backpack Mistblower from Germany

The SOLO PORT 423 is an engine-powered backpack mistblower made by SOLO Kleinmotoren GmbH of Sindelfingen, Germany. An engine-driven fan creates a strong airstream that breaks liquid from the tank into fine droplets and carries them a long way, spreading them widely. That makes it well suited to jobs where a large area has to be covered in a short time.

According to WHD's product information, the unit is suitable for public areas and vehicles, including aircraft, trains, ships and cars, as well as buildings, hospitals and factories. That matches the mix of vehicles and buildings found at rescue bases, hospitals and distribution centres.

Not a thermal fogger: many people call every sprayer a "fogging machine", but the SOLO PORT 423 is a mistblower. It uses air, not heat, to create droplets. A thermal fogger heats the liquid into a visible fog. A mistblower is therefore better suited to applying water-based disinfectants onto surfaces.

SOLO PORT 423 specifications

Source: table values are according to SOLO, the manufacturer. Additional details according to WHD's product information: 1.4 L fuel tank, dimensions 68 x 45 x 34 cm, and WHD describes it as an ULV system with droplets under 30 microns that helps save chemical. Actual droplet size depends on the nozzle and settings.

Design details that help in the field

According to WHD's product information, the unit is made in Germany with MAHLE parts and a BING carburettor, a Nikasil cylinder, a long spray tube with a wide-angle diffuser, a rotatable tube, a UV-resistant translucent tank that shows the liquid level at a glance, a wide filler, a one-hand lever for throttle, dosing and stop, a padded harness and four anti-vibration mounts. Overseas dealer information lists the standard nozzles as a four-setting misting nozzle, a long-reach nozzle, a wide-angle grille and a double-sided deflector. The deflector is especially handy for directing spray into wheel arches or low under a chassis. For other optional kits, ask the dealer directly.

Where the SOLO PORT 423 Fits in Fleet Disinfection

With a maximum airflow of 1,400 m³/h and a horizontal reach of about 12 m according to SOLO, one operator can cover long strips of a washed garage floor, walk along a row of vehicles and treat wheel arches, steps, bumpers and underbodies in a single pass. The strong airflow pushes droplets into tyre treads and chassis gaps a cloth cannot reach.

We recommend dividing the work into three zones:

• Full-power zone: garage floors, wash bays, driveways, washed vehicle exteriors, wheel arches, underbodies, flat-bottomed boats and the area around buildings.
• Reduced-speed zone: empty cargo boxes of delivery trucks, equipment stores and unoccupied crew rooms, with electrical items covered first.
• Hand-wipe zone: ambulance patient compartments, stretchers, medical devices, screens, radios and steering wheels, cleaned with a material-compatible disinfectant under your organisation's infection-control procedures.

The product disinfects; the machine delivers it. Results depend on the disinfectant you choose. Use a properly registered product that is compatible with vehicle materials and follow its label for dilution and contact time, for example Chemgene HLD4H disinfectant from WHD, used strictly according to its label and SDS.

10 Reasons Rescue Units, Hospitals and Logistics Firms Should Own a SOLO PORT 423

1. Disinfect during a shift change without long downtime or waiting for outside providers.
2. Strong airflow reaches wheel arches and underbodies, with 1,400 m³/h maximum according to SOLO.
3. About 12 m reach to cover garage floors and wash bays quickly.
4. One operator is enough, leaving the rest of the crew to rest or stand by.
5. A 12 L tank keeps going across several vehicles before refilling.
6. Works on boats and rescue gear: washed boats, life jackets and ropes can be treated in one place.
7. Protects crew health by keeping the base clean and reducing the spread of flood germs among staff. See the unit
8. Builds patient and customer confidence with a documented, verifiable procedure.
9. German build for heavy use. According to WHD, MAHLE and BING parts and a Nikasil cylinder.
10. Useful all year, not only after floods, for example in flu season or after transporting patients with infectious illness, following your organisation's guidance. Request a SOLO PORT 423 quote

Before and After

Step by Step: Disinfecting Vehicles and Depots After a Flood

1. Rotate the fleet. Keep one group of vehicles on standby while another is washed and disinfected.
2. Remove wet items such as floor mats, blankets, stretcher sheets, equipment boxes and any contaminated cargo.
3. Wash vehicles and wheel arches with water and detergent until no mud is visible, and wash the garage floor and wash bay too.
4. Let surfaces drain with doors and cargo boxes open, using fans in equipment stores and crew rooms.
5. Cover or remove moisture-sensitive items such as radios, displays, medical devices, sockets and engine bays. Never spray directly into electrical parts.
6. Mix the disinfectant per its label and fill the 12 L tank on level ground, away from vehicles with hot engines.
7. Wear full PPE: ear defenders, respiratory protection per the label, goggles, chemical-resistant gloves, long sleeves and boots.
8. Do the outdoor zone first. Start at the back of the garage and work towards the door. Treat exteriors, wheel arches and underbodies using the deflector, then the boats and rescue gear.
9. Treat indoor zones at reduced speed, wetting surfaces evenly as the label directs without pooling.
10. Wipe ambulance patient compartments by hand under your infection-control procedures, especially stretchers, grab handles, straps and medical devices.
11. Respect contact and re-entry times, ventilate the vehicle well, then return it to service.
12. Log every job with registration number, date, time, product, dilution and operator.

If your organisation is not ready to buy, or needs extra capacity during a crisis, WHD's disinfection service is a separate option.

Safety at Rescue Bases and Vehicle Depots

• Hearing protection: SOLO states 97 dB(A) at the operator. Always wear ear defenders, and at bases with radios, have someone else monitor calls while spraying.
• Limit continuous use: the engine vibrates, so take breaks and rotate operators, especially crew who have been on call all day.
• Chemical PPE: follow the label and SDS. Never spray into the wind, towards people or into an occupied cab.
• Refuel safely: switch off and let the sprayer cool before refuelling, outdoors, away from hot vehicles, medical oxygen cylinders and sparks.
• Weight: 11.0 kg dry according to SOLO, about 23 kg or more with a full tank. Watch for slippery, oily garage floors.
• Keep people and pets out: cordon off the garage while spraying and allow re-entry only after the label's stated time.
• Exhaust: never run the engine in a closed room; keep garage doors open.
• Train first: read the manufacturer's manual, practise starting, flow adjustment and emergency stop, and learn to clean the unit after use.

Frequently Asked Questions

1. How do I clean and disinfect a car after driving through floodwater?

Wash mud off the body, wheel arches and underbody with water and detergent, remove wet items, dry, then spray or wipe a registered disinfectant per its label. Have a mechanic check brakes and electrics too.

2. Can an ambulance be disinfected with a mistblower?

The exterior, wheel arches and depot, yes. Patient compartments and medical devices should be wiped under your infection-control procedures.

3. What is the SOLO PORT 423 price?

It depends on the package and purchasing terms. Contact WHD for a quote on 065-556-6294 or LINE @whd268.

4. Can this backpack sprayer reach under a vehicle?

Yes. The airflow and deflector direct droplets into wheel arches and under the chassis, but wash off the mud first and keep spray away from electrical parts.

5. How is the SOLO PORT 423 different from a fogging machine?

A thermal fogger uses heat to turn liquid into fog. The SOLO PORT 423 uses strong airflow to create droplets without heat.

6. Which disinfectant is best for vehicles after a flood?

A registered product whose label allows spraying and that suits vehicle materials, such as Chemgene HLD4H, used per its label and SDS.

7. How many vehicles can one 12 L tank cover?

It depends on vehicle size, the label's application rate and the machine settings. Record how much you use per vehicle on the first run to plan future jobs.

8. A rescuer has fever and calf pain after wading. What should they do?

See a doctor immediately and mention floodwater exposure, as these can be signs of leptospirosis. Disinfecting a site is not treatment.

9. Can foundations and private logistics firms buy the unit?

Yes. WHD supplies government agencies, hospitals, foundations and private companies. Contact WHD for purchasing details.

10. Is there a depot disinfection service if we do not buy?

Yes. WHD's disinfection service is a separate option. Check availability by phone or LINE.

Get Every Vehicle Back on the Road, Clean and Fast

Prepare your rescue base, hospital or logistics hub to disinfect on its own every time the water goes down. Ask about specifications, accessories and a SOLO PORT 423 quote today.

See SOLO PORT 423 Product and Price

Call 065-556-6294 | LINE @whd268

Related Reading

• SOLO PORT 423 backpack mistblower against dengue outbreaks for municipalities and TAOs (Thai)
• SOLO PORT 423 against emerging diseases for provincial public health offices (Thai)
• WHD disinfection service
• Chemgene HLD4H disinfectant

References

• Daily News, standing floodwater on Thoet Racha Road, Si Kan, Don Mueang (27 Sep 2026 / B.E. 2569): https://www.dailynews.co.th/news/6225817/
• Government Public Relations Department citing DDPM data as of 06:00, 7 Oct 2026 (B.E. 2569): https://www.prd.go.th/th/content/category/detail/id/33/iid/548715
• SOLO, PORT 423 Power Backpack Mister (manufacturer data): https://in.solo.global/gb/misters/107-port-423-power-backpack-mister-4015966423301.html
• CDC, Floods: https://www.cdc.gov/floods/
• Department of Disease Control, Thailand: https://ddc.moph.go.th/