A Story From the Field: The Parents' Chat Group That Would Not Stop Buzzing

Teacher Ann has run a small private kindergarten inside a housing estate in Bang Rak Phatthana subdistrict, Bang Bua Thong district, Nonthaburi, for almost ten years. The school is a converted two-storey detached house. Downstairs there are two classrooms and a nap room. Upstairs there is an activity room and a small office. Out front there is a little playground with a sandpit. Around forty children attend, most of them from families in the same estate or the estates next door.

During the 2026 floods, water rose to about mid-shin height on the ground floor and stayed for almost ten days. The day Teacher Ann unlocked the door and stepped back inside, a wave of damp, musty air mixed with the smell of mud hit her immediately. The children's sleeping mats, stacked in the nap room, were soaked through and dotted with mold. The foam play mats had swollen. The plywood toy shelves had puffed up and split. Every plastic toy in the baskets was smeared with mud. On the classroom walls, a straight tide line marked where the water had stood, with black specks of mold creeping above it.

Within a single day the parents' LINE group was buzzing nonstop. "Will the second term start on time?" "Are you throwing away the toys that got wet?" "My son has allergies. Is it safe for him to come back?" Teacher Ann knew that if her answers were vague, some parents might move their children elsewhere, and for a small school, losing even a handful of children makes a serious dent in income.

This article is a plan for owners of small private kindergartens, nurseries and childcare centers operating from houses or townhouses in residential estates. It covers sorting toys, cleaning, professional disinfection fogging and ozone treatment, and, just as importantly, how to communicate with parents so they feel confident sending their children back.

Why a Kindergarten Carries More Risk Than an Ordinary Home After a Flood

Young children explore with their hands and mouths. Kindergarten children sit, crawl and nap on the floor, put toys in their mouths, and do not wash their hands as thoroughly as adults. If floors and toys still carry germs from floodwater, such as the bacteria and viruses that cause diarrhea, the chance of those germs reaching a child is much higher than for an adult. And once one child falls ill, it spreads easily to classmates who share the same toys, tables and nap room.

Mold and allergies. An air-conditioned nap room, sleeping mats, blankets and foam play mats are all places where mold collects, and children breathe that air at close range for an hour or more every day. Mold spores can trigger allergies, coughing, sneezing and asthma in children with existing conditions. Young children's airways are smaller and more sensitive, so they often react sooner than the adults around them.

The playground and sandpit. Sand that sat under floodwater may be contaminated with sewage and rodent urine, raising the risk of leptospirosis, especially for children with small cuts on their hands or feet. Children dig, scoop and sit in sand, so it is one of the most direct routes of exposure on the whole property.

Business and trust. A small school survives on the trust of parents in its community. If children return and several of them fall ill one after another, or parents notice a musty smell at drop-off, the news travels fast in the estate's chat groups. Investing in proper preparation from the start costs far less than trying to repair a damaged reputation later.

Common Fixes That Fall Short in a Kindergarten

• Scrubbing the floor with strong bleach. This helps on the surface, but the harsh smell lingers, which is not suitable for a room where small children nap and crawl. It also does not reach the walls, skirting boards, or the space behind cupboards.
• Sun-drying every toy and putting them back. Fabric toys, stuffed animals, wooden toys and foam mats that were submerged have absorbed dirty water deep into the material. Sunlight alone cannot make them truly clean.
• Running fans and spraying air freshener. This masks the smell for a while but does not destroy mold or the source of the odor. Strong fragrance can also irritate the noses of children with allergies.
• Repainting so the rooms look bright and cheerful. If the walls are still damp and mold is growing inside, the paint will blister and the mold will return within months, while children are sitting in that room.

What a kindergarten needs is a complete sequence: sorting, cleaning, drying, disinfecting every surface, dealing with odor and airborne spores, and a final check before children return.

Sorting Toys and Supplies: What to Keep and What to Throw Away

Discard and replace: sleeping mats, pillows and blankets with mold; stuffed and fabric toys; wooden and plywood toys that have swollen; foam or rubber play mats that were submerged; picture books and paper teaching materials; all the sand in the sandpit; and any food or formula that came into contact with floodwater.

Clean and keep: hard plastic toys with no holes or hollow spaces where water could collect inside, plastic tables and chairs, and stainless steel containers. Wash with soapy water, scrub off the mud, rinse with clean water, then wipe or soak with a disinfectant following the product's instructions, and dry thoroughly.

Judge item by item: playground equipment, metal or plastic shelving, and solid wood furniture. If these are sturdy and have not swollen, they can be cleaned, disinfected and kept.

The simple rule is: when in doubt, throw it out. A child's health is worth more than the price of a toy. Keeping a list of discarded items, with photos, also helps when informing parents and planning the budget for replacements, and parents who want to help can choose items from the list to donate.

The Solution: CHEMGENE HLD4H Fogging and Ozone Treatment Before Children Return

The disinfection service from World Health Disinfection uses CHEMGENE HLD4H, applied with ULV (ultra-low volume) fogging equipment. ULV turns the disinfectant into a fine mist that reaches floors, walls, skirting boards, the space behind cupboards, the underside of tables, the children's restroom and the corners a cloth cannot reach.

After fogging, the team uses the ozone treatment service in rooms that can be closed, such as the nap room, classrooms and storerooms. Ozone helps destroy airborne mold spores and break down the odor molecules that have soaked into walls, ceilings and curtains.

The step-by-step process

1. School survey. The team checks how high the water reached and inspects the classrooms, nap room, children's restroom, kitchen and playground, then plans the order of work so the school can reopen on schedule.
2. Mud removal and sorting advice. The team advises which toys and materials should be thrown away, which can be washed and kept, and how long to wait for walls to dry.
3. Move children, classroom pets and plants out. Fish tanks, rabbits or potted plants in classrooms must be moved out first. Computers, sound systems and other electronics are covered.
4. ULV disinfection fogging. Floors, walls, furniture, restrooms and the kitchen are fogged while nobody is present.
5. Controlled ozone treatment. Rooms are closed with no people, animals or plants inside, and the dose and duration are matched to each room's size.
6. Ventilation. Doors and windows are opened, and the team tells the teachers when they can go back in to set up the rooms.
7. Re-check before term starts. Odor and moisture are checked again after the rooms are rearranged, and a follow-up treatment can be booked if needed.

Ozone safety: during ozone treatment there must be no children, teachers, pets or plants in the room, and the room must be fully ventilated before anyone returns. We recommend treating on a day when no children are at school and allowing ventilation time before the first day of term. Electronics, rubber items and delicate materials should be covered or removed.

A Two-Week Plan Before Term Starts for a Small Kindergarten

Days 1–4: clear mud, sort and dry. Teachers and volunteer parents shovel out mud, discard damaged items, wash floors and walls, and open the house up to let air flow through. Use fans and a dehumidifier if available. Ask an electrician to inspect the ground-floor wiring before switching anything on.

Days 5–7: disinfect and control odor. Book the team to fog the entire school and to treat the nap room, classrooms and storerooms with ozone. Ventilate fully the next day.

Days 8–11: set up the rooms again. Lay out the new sleeping mats, return toys that have been washed and disinfected, fill the sandpit with fresh sand, and have the air conditioners cleaned before using them.

Days 12–14: re-check and hold an open house. Check odor and former mold spots again, then invite parents to see the classrooms before term begins.

After floods, mosquitoes usually multiply in the puddles and blocked drains around housing estates, which is a major worry for parents of young children. A mosquito spraying service around the school fence can ease that concern.

How to Communicate With Parents So They Feel Confident

• Share the plan step by step. Post in the LINE group which day is for mud removal, which for disinfection, which for ozone treatment, and when classes resume. Parents will see that the school has a clear plan and is not improvising.
• Name the product and explain the method. Say which disinfectant is used, when ozone treatment takes place, and how the rooms are ventilated before children return. Transparency removes a great deal of anxiety.
• Show what has been replaced. Sleeping mats, toys, play mats and sandpit sand. Before-and-after photos help parents picture the work.
• Hold an open house. Inviting parents to walk through the classrooms before the first day builds more confidence than any message can.
• Invite questions about children with health conditions. Parents of children with allergies or asthma should consult their child's own doctor and let teachers know so they can keep a closer eye.
• Keep updates regular and calm. A short daily or every-other-day update, even when progress is slow, is better than silence. Parents mostly want to know that someone is in control.

Daily Hygiene Habits for the First Weeks Back

Even after professional disinfection, the first weeks after reopening deserve extra attention, because the surrounding neighborhood is still recovering and children bring in dust and mud on their shoes and clothes.

• Shoes off at a clear line. Set up a shoe area at the entrance and keep outdoor shoes out of classrooms and the nap room.
• Handwashing routines. Build handwashing into the timetable: on arrival, before meals, after outdoor play and after using the toilet. Make it a song or a game so young children enjoy it.
• Wipe high-touch surfaces daily. Door handles, table tops, light switches, tap handles and toilet flush buttons can be wiped with a ready-to-use product such as CHEMGENE HLD4H spray after children go home.
• Rotate toys. Keep only part of the toy collection out at a time, and wash the rest in batches, so every toy is cleaned regularly.
• Watch for returning odor. If a musty smell comes back in a corner or behind a cupboard, check for hidden moisture early rather than waiting for visible mold.

The Kitchen, Snacks and Milk: Areas That Deserve Extra Care

Most small kindergartens prepare snacks, lunches or milk on site, often in what used to be the family kitchen of the house. After a flood, this area deserves particular attention because anything that goes wrong here affects every child at once.

• Throw away food that touched floodwater. This includes sealed packets whose outside was submerged, rice and dry goods stored in low cupboards, and any formula or milk powder that may have been exposed. If you are unsure whether something got wet, discard it.
• Check the refrigerator and freezer. If the power was off for a long time, food inside may have spoiled even if the water never reached it. Clean the inside thoroughly and let it run empty for a while before restocking.
• Wash and sanitize all utensils. Children's plates, cups, spoons and feeding bottles should be washed with detergent, rinsed, and sanitized before use. Plastic utensils with deep scratches or cracks that held muddy water are best replaced.
• Replace wooden chopping boards. Wood that soaked up floodwater can harbor bacteria deep inside the grain.
• Check the water supply. If the estate's water supply was affected, follow local advice before using tap water for drinking or cooking, and use bottled water in the meantime.

The kitchen should be included in the disinfection fogging, and the cupboards should be completely dry before food goes back in.

Keeping Teachers and Volunteer Parents Safe During the Clean-Up

Teachers and parents often roll up their sleeves to help a small school recover. Their safety matters too.

• Wear protective gear. Rubber boots, waterproof gloves and a mask are recommended when shoveling mud or handling moldy materials.
• Protect cuts and scratches. Cover any wounds on hands and feet before starting work, and clean any new scratches promptly, because floodwater and mud can carry leptospirosis.
• Keep children away during the clean-up. Volunteers should not bring young children to the site while mud is being removed or before disinfection is finished.
• Take breaks and stay hydrated. Clean-up work in hot, humid weather is exhausting. Plan shifts so nobody overdoes it.
• Watch for symptoms. Anyone who develops fever, muscle pain or other unusual symptoms after taking part in flood clean-up should see a doctor and mention the flood exposure.

10 Reasons Small Kindergartens Choose the WHD Team

1. We plan the sequence of work around your reopening date, ideal for schools on a tight schedule.
2. We use CHEMGENE HLD4H disinfectant, a named product you can share openly with parents.
3. ULV mist reaches behind cupboards, under tables and into the corners children love to crawl into.
4. Ozone treatment for the nap room, where children breathe the air for an hour or more every day.
5. No need for air freshener, reducing irritation for children with allergies.
6. Safety first: we work on days without children and give a clear time for re-entry.
7. Practical advice on sorting toys helps you budget for replacements.
8. A dust mite removal service is available for cushions and rugs that were not submerged but sat in damp rooms.
9. A mosquito spraying service around the school fence after the water recedes.
10. Easy to reach by phone and LINE, so teachers can coordinate while juggling everything else.

Before and After: A Kindergarten Ready to Welcome Children

In the Words of a Kindergarten Owner

"At first I was afraid parents would move their children to another school. Once we posted the plan step by step, named the disinfectant, told them the ozone date, and opened the house so they could see the rooms before term, parents felt much more at ease. On the first day back, almost every child returned."

— Owner of a private kindergarten in a housing estate, Bang Rak Phatthana, Bang Bua Thong (a story from the field)

Frequently Asked Questions

When can children go back into a room after ozone treatment?
Only after it has been fully ventilated. The team will tell you when it is safe. We recommend treating on a day with no children and allowing at least one day before children return.

Can plastic toys that were submerged be kept?
Hard plastic toys with no hollow spaces where water can collect can be washed, disinfected and kept. Fabric, plywood and foam toys should be discarded.

Does the playground need disinfection too?
Wash the equipment and playground surface first, then include it in the fogging. Sand in a sandpit that was flooded should be replaced completely.

What about fish or small pets in the classroom?
Move them out of the room before fogging and ozone treatment, and bring them back once ventilation is complete. Keep them somewhere cool and quiet in the meantime, and change the tank water before returning fish to the classroom.

Can children with allergies or asthma come back?
Disinfection and ozone treatment help reduce mold and musty odor in the rooms, but decisions about each child's health should be made with the child's own doctor.

How long does the fogging and ozone work take on the day?
For a converted house of this size, the treatment itself usually fits within a single day, including ventilation time. The overall timeline depends much more on how long it takes to clear mud, discard damaged items and let the walls dry, which is why we recommend booking the survey as early as possible after the water recedes.

Does the upstairs floor need ozone treatment if it did not flood?
If the upper floor smells musty from humidity rising from below, or if items from downstairs were moved up there, it is worth treating. The team will assess this during the survey.

Get Your School Ready to Welcome Children Back With Confidence

Kindergartens, nurseries and childcare centers in Bang Bua Thong and across Nonthaburi can contact us for a site survey and a plan that meets your reopening date.

View Disinfection Service – Click Here

Book Ozone Treatment – Click Here

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

Related Articles and Resources

• Residential ozone disinfection
• CHEMGENE HLD4H spray for tables and high-touch surfaces
• Master Ozone Generator
• All articles
• External sources: WHO: Floods and health and Thailand Department of Health

#PostFloodDisinfection #KindergartenDisinfection #OzoneTreatment #MustyOdorRemoval #MoldRemoval #Disinfectant #SchoolReopeningAfterFlood #MosquitoSpraying

Keywords: kindergarten disinfection after flood, ozone treatment kindergarten, small private kindergarten, children's toys after flood, preparing school reopening after flood, Bang Bua Thong, Nonthaburi 2026