Dust Mite Removal Helped a 96-Worker Rayong Camp Sleep Better

Last updated: 10 Nov 2026 | 14 Views |

A Cough in the Dark: 96 Workers, 64 Bunks and a Camp Nobody Could Explain

At 2:10 in the morning, Prasert Wongsawat, a 47-year-old site foreman, walked slowly along the corridor of the workers' camp beside a factory-expansion project in Nikhom Phatthana, Rayong. It was his weekly night round. This time he stopped at the end of the corridor and simply listened. Behind the thin plywood doors, in room after room, people were coughing. Not one cough, not two, but a dry, scratchy chorus that never quite stopped.

The camp housed 96 workers: 58 Thai men and women from Buriram, Surin and Sisaket, and 38 colleagues from Myanmar and Cambodia who had come to Thailand to build things for a living. They slept in eight rooms with 64 bunks. Because the project ran a day crew and a night crew, 32 of those bunks were shared. When one worker climbed out at 6 in the morning, another climbed in. The mattresses, thin foam pads about five centimetres thick, had been bought three years earlier and, as far as anyone could remember, never cleaned.

Prasert did not yet know it, but the story of that night would end with a service he had never heard of: professional dust mite removal for the sleeping areas. Before we get there, though, we should tell the whole story honestly, because it is a story many camp managers, contractors and factory owners in Thailand will recognise. Names and some details have been adjusted to protect the privacy of the people involved, and the numbers are given as the camp recorded them.

The Numbers That Made the Foreman Worry

Prasert is not a man who panics. He had run crews through monsoon floods and a tight handover deadline, and he kept a notebook on everything. In that notebook he tracked sick leave. For the first eighteen months of the project, the camp averaged about 7 sick days per week across all 96 workers. That is normal for heavy outdoor work in Rayong's heat.

Then the figure started to climb. In March it was 11. In April it was 15. By June it had reached 23 sick days per week. In the notebook he also began to write something new: the word night cough, and the number of rooms where he heard it. In March it was two rooms. By June it was seven out of eight.

Sick days per week rose from about 7 to 23 in under four months
Night coughing was heard in 7 of 8 rooms
Eleven workers visited the district clinic with a persistent cough and blocked nose in a single month
Two skilled welders asked to go home early, citing broken sleep
Productivity on the night crew slipped, and a safety near-miss was logged in May after a tired crane signaller misjudged a signal

At 450 baht per worker per day in wages and lost output, 23 sick days a week is more than 10,000 baht every week, before counting delays, overtime to cover absences and the quiet cost of tired people working at height. Prasert could do the arithmetic. He could not explain it.

The Foreman's Theory: It Must Be the Dust from the Site

Like most foremen, Prasert had a theory, and it was a sensible one. The project sat in a dry stretch of the season. Heavy trucks hauled sand and crushed stone along an unpaved access road. Excavation had opened the ground. On windy afternoons a pale haze drifted across the camp fence. Of course people were coughing, he reasoned. It was the dust from the site.

So he acted. He hired a water truck to spray the access road twice a day. He bought boxes of masks and handed them out at the gate. He ordered the camp's windows to be kept closed in the afternoon. He even rearranged the work plan so that the dustiest tasks were finished before noon. It was a responsible, expensive response, and it should have helped, but it was not dust mite removal, and the dust mites were still there.

For about two weeks the number dipped. Then it climbed again. The strange part, which Prasert noticed only when he re-read his own notebook, was the Sundays. On Sundays the site was closed. No trucks, no digging, no haze. Yet the Monday morning sick list was often the longest of the week, and the night cough on Sunday night was, if anything, worse. Workers who stayed in the camp all day were the ones who coughed most.

That detail did not fit the theory. A cause that disappears on Sunday should not make Sunday night worse.

A Nurse, a Notebook and a Different Question

The turning point came from an unexpected place. Khun Nong, a nurse at the small clinic in the district town, had been seeing the camp's workers more and more often. She was gentle, practical and careful with her words. One afternoon, while writing out a prescription for a young worker from Mon State named Zaw Min, she asked a question that had nothing to do with the construction site.

"Where do you sleep, and what do you sleep on?"

Zaw Min explained, a little shyly, that he slept on the lower bunk of the third room, on a foam mattress. He worked the day shift, so he shared the bunk with a night-shift colleague he had never actually met. They only knew each other by the warmth left on the pad. His eyes itched in the morning and his nose was blocked every night, but never at the work site.

Khun Nong did not claim to have a diagnosis from a prescription pad. What she said was modest and sensible: nights-only symptoms, symptoms that are worse after a day off in the room, itchy eyes, a blocked nose and a dry cough are a pattern doctors often see with indoor allergens. One of the most common indoor allergen sources in the world is dust mites living in bedding and mattresses. She suggested that Prasert look at the beds, not only the road.

What the Camp Really Looked Like at Night

The next Sunday, Prasert did something he had never done. He went into the rooms in daylight, one by one, and looked at the bunks the way a stranger would. We describe what he saw without blame: it came from ordinary pressure, a fast project, a tight budget and many people needing a place to rest.

Thin foam mattresses, flattened and darkened by three years of use, with no washable covers
Bunks shared between day and night crews, so a mattress was almost never empty or fully dry or cool
Sweat, skin flakes and humidity from hard outdoor work carried into the bed every day
Pillows and blankets that each worker had brought from home, washed rarely because a day is short and laundry lines are few
Rooms with a small fan and a single window, closed in the afternoons by the foreman's own instruction
Floors mopped, but mattresses never treated, because nobody thought a mattress could be a problem

Rayong is hot and humid for most of the year. A mattress that is occupied around the clock, warmed by one body and then by another, is a very comfortable place for dust mites. These are microscopic creatures, invisible to the eye, that feed on the tiny flakes of skin every person sheds. You do not need a dirty room to have them. You only need a bed, warmth, humidity and time.

The Pain Behind the Statistics

It is easy to write about a camp like this in cold numbers. But every sick day was a person. Zaw Min was twenty-four, sending money to his mother and younger sister. Somsak, a rigger from Surin, was a father of three who had been sleeping badly for two months and was ashamed to ask for a day off. A Cambodian scaffolder named Sophea quietly bought nasal spray with his own wages and told nobody.

Health and sleep

Broken sleep is not a small thing for people who climb scaffolds and operate cranes. Night coughing, an itchy nose and morning sneezing do not by themselves mean a serious disease, but they steal rest. A worker who sleeps four hours is more likely to make mistakes at height.

Money

Every sick day costs the worker, the contractor and the project. Medicine, clinic visits, extra overtime for cover and slowed progress add up faster than anyone expects. A camp that quietly loses 10,000 baht a week loses more than half a million baht in a year.

Respect and morale

There was a quieter cost as well. Workers began to feel that the company saw them as a line in a spreadsheet. Some migrant workers believed they were being blamed for being sickly. Some Thai workers privately wondered whether it was worth coming back for the next project. People who work hard deserve a bed that does not make them ill, and they notice when someone cares enough to check.

Why the Usual Fixes Do Not Work Against Dust Mites in Mattresses

Prasert, like most of us, tried the obvious things first. This is what he learned about each of them.

Spraying the road and handing out masks

These measures are sensible for site dust, and they should continue. But they do nothing about what is living inside a mattress. Dust mite allergens are carried in heavier particles that settle into fabric. A mask worn at work does not follow the worker into bed.

Sweeping and mopping

A broom lifts fine dust into the air and drops it again. A damp mop cleans the floor. Neither reaches the depths of a foam pad or a pillow.

Ordinary household vacuum cleaners

Many cheap vacuums pull dust in and then blow some of the finest particles straight back out through the exhaust. In a small, closed dormitory room, that can make the air worse for the next few hours.

Air fresheners and sprays

A pleasant smell does not remove allergens. Spraying scented products on bedding can irritate sensitive noses and leaves the real problem in place.

Replacing all the mattresses instead of dust mite removal

Replacing 64 mattresses was the first suggestion from the head office, and it is expensive. New mattresses are also not a permanent answer. Without a cleaning routine, a new mattress in a shared, warm room can collect dust mites again over the following months.

The lesson was simple. The problem was not only the dust outside. It was the dust mite buildup inside the beds that nobody had ever cleaned out.

Meeting the Dust Mite Removal Service from WHD

A friend who managed a hotel in Pattaya mentioned a Bangkok-based company that does professional dust mite removal on mattresses and sofas using a water-filtration vacuum. Prasert called World Health Disinfection (WHD), expecting a sales pitch. What he got was a practical conversation about the camp's real situation: how many beds, how many rooms, when the shifts changed, how much time the rooms could be empty.

WHD's technicians explained that the WHD dust mite removal service uses the SIRENA System, a water-filtration vacuum. Instead of trapping dust in a bag that might leak, it pulls air and debris through water, then through a HEPA filter rated down to 0.02 micron. In plain language, it captures very fine particles and keeps them inside the machine rather than blowing them back into the room. The service was designed for places where many people share beds: hotels, hospitals, dormitories and, yes, worker camps.

Prasert asked the question every foreman asks: could the work be done without sending 96 people to sleep on the floor? The answer was yes. WHD planned the job around the camp's shifts, working room by room, so that no worker lost a night's sleep and the project lost no work hours.

How the Work Was Done, Step by Step

On a Saturday, four technicians arrived in clean uniforms with the equipment. They began by greeting the workers, in Thai with a few words of Burmese and Khmer, and explaining what would happen. Prasert noted that the tone was respectful, not clinical. The dust mite removal team treated the bunks as people's personal space.

Walk-through of each room before dust mite removal begins, to count bunks and note the condition of mattresses and pillows
Removal of loose bedding, which workers could have washed separately
Slow, systematic vacuuming of each mattress surface, edges and seams with the SIRENA System, using attachments made for fabric
Treatment of pillows and the underside of the upper bunk frames, where dust gathers
A brief explanation to the workers of simple habits that help between visits
A short report to the foreman, with a note of which mattresses were in the worst condition

Eight rooms and 64 bunks of dust mite removal were finished in two days. Zaw Min watched the first mattress being treated. When the technician showed him the water in the collection chamber, which had turned a murky grey brown, he was quiet for a moment. Then he laughed, a little embarrassed, and said that now he understood why his nose was blocked.

That small demonstration, seeing what came out of the bed, did more for morale than any speech. The camp had a visible answer to a problem that had felt invisible.

10 Reasons to Choose WHD Dust Mite Removal for a Worker Dormitory

Prasert later wrote down why he would recommend dust mite removal to other camp managers.

Water-filtration technology. The SIRENA System pulls dust through water, so fine particles are captured rather than released back into the room.
HEPA filtration to 0.02 micron. A final HEPA stage handles extremely fine particles that ordinary vacuums miss.
It reaches where mops cannot. Foam pads, seams, pillows and bunk frames are treated, not just the floor.
No mattress replacement needed. The existing beds are cleaned and kept in use, which protects the budget.
Scheduled around shifts. Work is planned room by room so that the day and night crews still get their sleep.
Fast for large numbers. A team can treat dozens of bunks in a day, which suits camps, hostels and hotels.
No strong chemical smell. The process relies on suction and filtration, so rooms are usable soon afterwards.
Visible proof. Seeing the dust mite debris collected in the water helps workers and managers understand the problem.
Respectful, trained technicians. The team treats the workers' bunks as personal space and communicates clearly with Thai and migrant colleagues alike.
Dust mite removal as part of a larger hygiene routine. WHD also supplies disinfection products and services, so camps can build a complete plan with one trusted partner.

Before and After: The Camp in Numbers

Before WHD dust mite removal	Six weeks after WHD dust mite removal
23 sick days per week	9 sick days per week
Night coughing heard in 7 of 8 rooms	Night coughing heard in 2 of 8 rooms
Mattresses flat, dusty and never cleaned	Mattresses vacuumed, fresh and tidy
Itchy eyes and blocked noses on waking	Far fewer complaints from the workers
Workers blamed the site, the weather or themselves	Workers felt that someone had listened

To be fair and accurate: the camp also continued to spray the access road and the rainy season arrived, so not every improvement can be credited to one cause. Prasert is careful about this. But the timing, the visible results from the first mattress and the quiet Monday mornings that followed convinced him that the beds had been a major missing piece.

A Foreman's Words

"I spent two months spraying water on a road and blaming the site. The real answer was under our own people's heads every night. Nobody had done anything wrong. We just had not looked. After the dust mite removal, the corridor at 2 in the morning was quiet for the first time in months. I stood there and, honestly, I was a little emotional." Prasert W., site foreman, Rayong

Zaw Min also shared his view through a colleague who translated: he said that he felt respected because the company cared about where he slept. For a young man far from home, that matters more than most managers realise.

What Are Dust Mites, and Why Does Dust Mite Removal Matter?

Dust mites are tiny arthropods, related to spiders, far too small to see. They live in bedding, mattresses, sofas and carpets and feed on shed human skin. They do not bite. The problem is their droppings and body fragments, which are among the most common triggers of indoor allergy and can aggravate asthma in people who are sensitive. The World Health Organization lists indoor allergens, including dust mites, among factors that can worsen asthma; you can read more in the WHO asthma fact sheet. Thai readers can also find general guidance on respiratory health from the Department of Disease Control, Ministry of Public Health.

It is important to be modest here. Dust mite removal does not cure any illness, and a persistent cough should always be checked by a doctor. A camp should not assume that every cough is caused by mites. What a cleaner bed can do is remove one common source of irritation, so that other causes, if any, can be identified. That is a sensible, low-risk step for any shared accommodation.

Practical Advice for Camp Managers and Contractors

You do not need a crisis to start. Here is a simple routine inspired by what Prasert's camp learned.

Track sick days and night coughing the way you track safety incidents. Patterns appear when you write them down.
Look at Sundays and days off. If symptoms are worse when people stay in the room, think about the room.
Provide washable mattress covers to support dust mite control and encourage regular washing of pillows and blankets, and make laundry facilities available.
Open windows and let sunlight and airflow in during the cooler parts of the day when site dust is low.
Plan professional dust mite removal for shared bunks at least every three to four months, or more often in hot, humid conditions.
Talk to workers respectfully, in their own language where possible. They know which bunk gives them trouble.
Keep working on site dust control too. Both matter, and they work on different problems.

Camps, hostels and small hotels all face shared beds, constant use and little time. A scheduled service is often cheaper than the cost of sick days.

Give Your Workers a Bed They Can Rest In

Professional dust mite removal with the SIRENA System water-filtration vacuum and HEPA filtration to 0.02 micron, planned around your shifts.

See the Dust Mite Removal Service and Request a Quote

Call 065-556-6294 or add LINE @whd268

Frequently Asked Questions About Dust Mite Removal

What is a dust mite removal service?

It is a professional cleaning service that uses a water-filtration vacuum and HEPA filtration to take dust mites, their droppings and fine dust out of mattresses, pillows and sofas, rather than just moving dust around.

Can dust mite removal be done in a worker dormitory without disturbing shifts?

Yes. WHD plans the work room by room around day and night crews, so workers keep their sleep and the project keeps its working hours.

Will dust mite removal cure a persistent cough?

No. It removes one common source of indoor allergens. A cough that lasts should be checked by a doctor, because it can have many causes.

How often should shared bunks be treated?

Many managers choose every three to four months for shared and heavily used beds, and more often in hot, humid conditions or when complaints rise.

Do we need to replace our mattresses?

Not necessarily. Professional dust mite removal cleans existing mattresses, so replacement is needed only when they are physically worn out.

Does the service use strong chemicals?

The process relies on suction, water and HEPA filtration, so there is no strong chemical smell and rooms can be used soon after.

What machine does WHD use?

The SIRENA System, a water-filtration vacuum with HEPA filtration to 0.02 micron.

Is the service only for worker camps?

No. It is also used in homes, hotels, hostels, clinics and offices that want cleaner bedding and upholstery.

How do I book?

Call 065-556-6294 or add LINE @whd268, and tell the team the number of beds and rooms so they can plan the visit.