Dubai Municipality law requires all residential and commercial water tanks to be professionally cleaned every 6 months. Dirty tanks harbour Legionella, E. coli, and other dangerous bacteria that cause serious illness — especially in children and the elderly. Total Defence is a Dubai Municipality-approved water tank cleaning company serving Dubai, Sharjah, and Ajman. Book your free inspection today.

1. Why water tank cleaning in Dubai is a matter of life and health

Most Dubai residents never think about their water tank. You turn on the tap, water comes out, and life goes on.

But what is actually happening inside that tank — sitting on your rooftop in 45°C heat, potentially uncleaned for months or even years — is something most people would find deeply alarming if they knew.

Dubai’s water supply starts clean. Dubai Municipality and DEWA treat water to international standards before it leaves the treatment plant. The problem is what happens next.

That water travels through the city’s pipes and sits inside your building’s storage tank — often a large fibreglass or concrete tank on the roof — before it reaches your tap. And once water sits still in a warm, enclosed environment, the clock starts ticking.

Bacteria multiply. Biofilm forms. Sediment accumulates. Algae grows when sunlight penetrates the tank walls. And every shower, glass of water, and meal cooked in your home uses that stored water.

This is not a rare problem. It is happening right now in thousands of Dubai apartments and villas where tanks have not been cleaned within the last six months. The question is not whether your tank is at risk — it is whether you already know the answer.

This guide covers every real question Dubai residents and business owners search for about water tank cleaning — from the health risks that nobody talks about, to the exact legal requirements, to how to choose the right licensed company.

2. What is actually growing inside your Dubai water tank right now?

If your water tank has not been professionally cleaned in the last six months, here is what scientific studies and Dubai-based inspection reports consistently find inside:

Legionella pneumophila — the bacteria that causes Legionnaires’ disease, a life-threatening form of pneumonia. It flourishes in warm, stagnant water above 35°C — which describes every uncleaned Dubai rooftop tank from April through October.

E. coli and total coliforms — bacteria from faecal contamination that cause severe gastroenteritis, stomach cramps, diarrhoea, and in serious cases, kidney failure. A real E. coli outbreak in Jumeirah was traced directly to a residential tank with ignored maintenance.

Pseudomonas aeruginosa — a bacteria that causes skin infections, ear infections, and respiratory illness, particularly dangerous for immunocompromised individuals.

Salmonella — causes food poisoning-like symptoms that can last for days and be life-threatening in children and the elderly.

Biofilm — a slimy bacterial layer that forms on tank walls within just 72 hours in an untreated tank. Once established, biofilm becomes a protected breeding ground where bacteria multiply even if incoming water is treated.

Sediment and rust — sand and dust enter tanks from Dubai’s environment, settling at the bottom. Metal tanks and pipes corrode, releasing rust particles that turn water reddish-brown. This sediment clogs fixtures and damages pumps.

Algae and mould — grow when sunlight penetrates tank walls, adding further layers of contamination to everything you drink, cook with, and wash in.

Research is stark: up to 80% of unmaintained water tanks in Dubai harbour harmful bacteria. And studies show that biofilm and serious microbial growth can establish themselves inside an untreated tank in as little as 12 to 18 months.

3. Can my water tank give me Legionnaires’ disease in Dubai?

Yes — and this is not a theoretical risk. It is one of the most documented health threats associated with water storage in the UAE.

Legionella pneumophila thrives in warm, stagnant water, and Dubai’s rooftop tanks during summer create nearly perfect conditions for its growth. Water sitting at temperatures above 35°C — which happens inside uncovered or poorly insulated rooftop tanks from spring through autumn — allows Legionella to multiply to dangerous levels.

The disease it causes — Legionnaires’ disease — is a severe form of pneumonia. Symptoms include high fever, coughing, shortness of breath, muscle pain, and confusion. It is fatal in approximately 10% of cases and significantly more dangerous in the elderly, smokers, and anyone with a weakened immune system.

Legionella spreads primarily through inhaling water droplets — meaning showering is a primary exposure route. You do not need to drink the water to become seriously ill.

This is why Dubai Municipality’s Technical Guidelines specifically mandate Legionella control protocols for water systems, including mandatory flushing, temperature monitoring, and regular professional cleaning of all storage tanks.

If your tank has not been cleaned in more than six months, Legionella risk is real. Do not wait for symptoms to appear.

Our tank cleaning service at Total Defence follows Dubai Municipality’s full Legionella control protocol for every residential and commercial clean.

4. Is there E. coli in Dubai water tanks?

Studies on household water tanks in Dubai have confirmed the presence of E. coli and other faecal indicator bacteria in tanks that are not regularly maintained. A documented outbreak in a Jumeirah residential building was traced directly to a tank where maintenance had been postponed.

E. coli contamination in a home water tank is not primarily about the source water — DEWA’s treated supply typically has no E. coli. It enters through poorly sealed tank lids, through cracks in ageing tanks, through contaminated cleaning equipment, or through the biofilm that builds up on tank surfaces over time.

Symptoms of E. coli infection range from stomach cramps and bloody diarrhoea to severe kidney complications requiring hospitalisation. Children under five, pregnant women, and elderly residents face the highest risk of serious complications.

If your family is experiencing recurring digestive problems with no clear food source, your water tank should be one of the first things you investigate. A professional inspection and water quality test will confirm whether contamination is present.

5. Can showering in dirty tank water make me sick?

Absolutely yes — and this surprises most people, who assume that only drinking contaminated water poses a risk.

When you shower, you breathe in tiny water droplets. If your tank water contains Legionella, those droplets carry the bacteria directly into your lungs — which is the primary infection route for Legionnaires’ disease. You do not need to swallow a single drop to develop a serious respiratory infection.

Beyond Legionella, showering in bacteria-contaminated water exposes your skin to pathogens. Pseudomonas aeruginosa — commonly found in untreated tanks — causes folliculitis (skin infections around hair follicles) and ear infections. People with eczema, psoriasis, or other skin conditions face a significantly elevated risk.

Bacteria and chemical imbalances in tank water also affect your hair directly. Poor water quality is a well-documented cause of hair thinning, scalp irritation, and increased hair loss in Dubai residents — a problem that many attribute to the hard water supply, when the real cause is often bacterial or chemical contamination in an uncleaned tank.

If your skin or scalp feels worse after showering, or if family members are developing rashes or infections without an obvious cause, your water tank is a serious suspect.

6. Can dirty tank water cause hair loss and skin problems?

This is one of the most searched questions in Dubai — and the connection is more direct than most people realise.

Twenty years of professional tank cleaning experience in the UAE has established a direct link between neglected water tanks and chronic dermatological issues among residents. The specific culprits are:

Bacterial contamination — Pseudomonas and other bacteria in tank water cause scalp inflammation, folliculitis, and skin rashes when you wash or shower.

Chemical imbalances — as water sits in an uncleaned tank, disinfection chemicals break down and pH levels shift. Water that is too acidic or too alkaline strips the scalp of natural oils, weakens hair follicles, and causes chronic dryness and breakage.

Heavy metal leaching — corroding metal tanks release iron, zinc, and other metals into the water supply. These cause reddish or greenish discolouration and are directly associated with scalp irritation and hair loss in long-term exposure.

Sediment and biofilm — fine particles in water from sediment buildup clog hair follicles and cause persistent scalp irritation.

Many Dubai residents spend significant money on hair loss treatments, dermatologist visits, and premium shampoos — without ever addressing the contaminated water tank that is causing the problem. A AED 400 professional tank clean every six months prevents all of this.

For full property cleaning and disinfection alongside tank cleaning, visit our disinfection and sterilisation service.

7. Is Dubai tap water safe for my baby and children?

Children under five are among the most vulnerable groups when it comes to waterborne pathogens — their immune systems are still developing, and a bacterial load that an adult’s body handles without obvious symptoms can cause serious illness in a young child.

The specific risks from an uncleaned Dubai water tank for babies and young children include:

E. coli and Salmonella — cause severe gastroenteritis in babies. Symptoms include vomiting, diarrhoea, fever, and dehydration, which can become life-threatening rapidly in infants.

Legionella — while adults typically contract Legionnaires’ disease through inhalation, babies bathed in warm water from a contaminated tank face direct exposure risk.

Chemical contaminants — when disinfectants in tank water break down improperly, by-products can form that are harmful to developing organ systems.

Heavy metals — iron, copper, and zinc from corroding tanks and pipes affect neurological development in infants and toddlers with prolonged exposure.

If you are mixing baby formula with tap water, cooking for young children, or bathing an infant, your water tank’s cleanliness is not optional. It is a direct child safety issue.

Total Defence offers rapid scheduling and same-day inspections — book before the next feed, not after a health scare.

8. Does Dubai’s summer heat make tank water more dangerous?

Yes — and this is one of the most important facts that Dubai residents do not fully appreciate.

Dubai’s summer months (April through October) create conditions that turn a neglected water tank into an accelerated bacteria laboratory:

Rooftop tanks in Dubai can reach internal water temperatures above 45°C during peak summer. Legionella, the most dangerous waterborne pathogen in UAE tanks, reaches its most dangerous multiplication rate between 25°C and 50°C. At 45°C, a tank left uncleaned provides near-perfect conditions for explosive Legionella growth.

Biofilm — the bacterial layer on tank surfaces — also forms and spreads significantly faster in warm conditions. What might take months to develop in a cooler climate establishes itself within weeks in a Dubai summer.

Algae and mould, which require warmth and any available light to grow, bloom rapidly in summer — especially in older fibreglass tanks where the walls have become slightly translucent with age.

The practical implication: if your tank was cleaned in November, do not assume it is still safe in July. Many Dubai residents and building managers follow an annual schedule — but Dubai Municipality’s six-month requirement exists precisely because of the summer heat acceleration factor.

For complete pest and contamination protection year-round, explore our full pest control services alongside tank cleaning.

9. My rooftop tank sits in direct sun — is that dangerous?

For villa owners in particular, this is an urgent concern. Detached villas in areas like Arabian Ranches, Mirdif, Al Barsha, and Jumeirah typically have individual rooftop tanks that sit in full sun exposure — unlike tanks inside large apartment buildings, which are often partially shielded by the building structure.

Direct sun exposure accelerates every contamination risk:

Water temperature inside a directly sun-exposed rooftop tank can exceed 55°C during Dubai’s peak summer. Above 50°C, some pathogens are killed — but below 55°C is the danger zone where Legionella not only survives but multiplies aggressively.

UV penetration through ageing fibreglass tank walls encourages algae growth that would not occur in a fully opaque, shaded tank. Once algae establishes in a tank, it creates a nutrient source and biological matrix for additional bacterial growth.

Thermal cycling — the tank heating during the day and cooling at night — creates condensation and pressure fluctuations that accelerate the breakdown of tank walls, leading to micro-cracks through which environmental contamination can enter.

Villa owners should consider scheduling tank cleaning at the beginning and end of summer — in March/April and September/October — to bracket the highest risk period.

10. My family keeps getting stomach issues — could it be the water tank?

This is one of the most commonly searched questions in Dubai — and the answer is: yes, it very possibly could be.

The challenge with water tank contamination as a cause of household illness is that the symptoms closely mirror food poisoning, viral stomach bugs, and general gastrointestinal infections. Families often cycle through multiple doctor visits, dietary changes, and antibiotic courses without anyone suggesting the water tank as a source.

Key indicators that your water tank may be the cause of recurring family illness:

Multiple family members experience similar symptoms — nausea, stomach cramps, diarrhoea — without a common food source being identified.

Symptoms are mild but persistent — recurring every few weeks rather than being a single acute episode.

Symptoms improve when family members travel or stay away from home for several days.

Children are affected more frequently or more severely than adults.

The water has recently developed a different taste, smell, or colour — even slightly.

If any of these patterns match your family’s experience, a professional tank inspection and water quality test should be the immediate next step — before spending more money on medical consultations for a problem that starts at your rooftop.

11. How do I know if my water tank needs cleaning right now?

Your tank is telling you it needs attention. Here are the warning signs most people miss:

Water colour changes — brown, yellow, or cloudy water is never normal from a clean tank. Discolouration indicates sediment, rust, or bacterial growth.

Unusual taste — metallic, earthy, or chlorine-heavy taste that was not there before signals chemical imbalance or bacterial breakdown of disinfectants.

Strange smell — any musty, sulphurous, or chemical smell from your tap is a direct sign of bacterial activity or sediment decomposition in the tank.

Floating particles — visible particles in water coming from your tap indicate sediment buildup that has entered the supply line.

More than 6 months since last cleaning — even if water looks and tastes normal, biological contamination can be well established before it becomes detectable by sight or smell. If you cannot confirm the last cleaning date, treat the tank as overdue.

New or recurring household illness — as covered in section 10, recurring stomach or respiratory issues with no clear external cause should prompt immediate tank inspection.

If you cannot get a straight answer from your building management about the last cleaning date, contact Total Defence for a free inspection. We will assess the tank, test the water, and give you an honest answer — with no obligation to book.

12. How often is water tank cleaning required by law in Dubai?

Dubai Municipality regulations are clear and non-negotiable on this point:

All residential and commercial water storage tanks in Dubai must be professionally cleaned and disinfected at least once every six months.

This is not a guideline or a recommendation. It is a legal requirement under Dubai Municipality’s Public Health and Safety regulations, aligned with UAE Federal Law No. 24 of 1999 on Environmental Protection.

The six-month requirement applies to:

No exemptions apply. A single-family villa is subject to the same legal requirement as a fifty-storey tower.

For high-risk facilities including schools, hospitals, and restaurants, quarterly cleaning (every three months) is the standard required by Dubai Municipality — and best practice for any property where vulnerable people are regularly present.

13. Who is responsible — landlord or tenant?

This is one of the most common points of confusion for Dubai tenants — and one that landlords often exploit.

Under Dubai law and RERA regulations, the general principle is:

Landlords are responsible for maintaining the building’s water tanks, including ensuring they are cleaned to Dubai Municipality standards. This is considered structural maintenance — part of the landlord’s obligation to provide a habitable property.

Tenants in apartments should request the cleaning record from building management. If your building management cannot provide a certificate showing cleaning within the last six months, the landlord or building management company is in violation of Dubai Municipality regulations — and you have grounds to demand immediate action in writing.

Villa tenants should check their tenancy contract. Responsibility for villa tank cleaning is sometimes transferred to the tenant in the contract — this is legally permissible, so read your agreement carefully.

Villa owners are directly responsible for their own tanks. There is no building management to delegate to — the owner must arrange cleaning and maintain records.

Practical advice: always request the tank cleaning certificate in writing before moving into a new property. This creates a paper trail and establishes the date from which your six-month cycle starts.

If your landlord is unresponsive, document your request by WhatsApp or email, set a clear deadline, and if necessary, arrange cleaning yourself and seek to recover the cost through RERA’s dispute resolution process.

14. Can I clean my water tank myself in Dubai?

No — and this is not a technicality. It is a hard legal rule with real consequences.

Dubai Municipality regulations require that all water tank cleaning in Dubai must be performed by a licensed contractor holding a valid Dubai Municipality permit. Property owners, tenants, and building managers cannot legally clean tanks themselves — even with appropriate cleaning products.

The reasons behind this rule are practical as well as regulatory:

Professional cleaning requires entry into a confined space, which requires specific safety training and equipment. Technicians must use Dubai Municipality-approved disinfectants at the correct concentrations — products that are not available to the general public. Water quality testing after cleaning must be performed with calibrated laboratory equipment and documented against UAE drinking water standards.

The certificate issued after professional cleaning — required for compliance records and Dubai Municipality inspections — can only be issued by a licensed contractor.

If a Dubai Municipality inspector visits your property and finds that tanks were cleaned by an unlicensed individual, the violation is treated the same as no cleaning at all, regardless of how thoroughly the work was done.

For businesses and commercial properties, our commercial pest control and maintenance service can be combined with tank cleaning under a single annual compliance contract.

15. Can Dubai Municipality fine me for not cleaning my water tank?

Yes — and the fines are significant enough to make professional cleaning the far less expensive option.

Businesses face fines of up to AED 50,000 for non-compliance with water tank cleaning regulations, plus potential facility shutdown orders. For a restaurant, hotel, or commercial property, the reputational and operational cost of a shutdown far exceeds any saving made by skipping or delaying tank cleaning.

For residential properties, violations can result in formal notices requiring immediate remediation, as well as liability exposure if a tenant or occupant becomes ill due to contaminated water.

Specific violations that Dubai Municipality inspectors issue notices for include expired cleaning certificates (more than six months since last cleaning), use of unlicensed contractors for the cleaning, failed water quality tests during inspection, and improper tank maintenance or damaged tank infrastructure.

The certificate you receive from a licensed cleaning company is your legal documentation. Keep it on file and set a calendar reminder at the six-month mark.

If you have fallen out of compliance — whether due to an unresponsive landlord, a gap in building management, or simply losing track — Total Defence can restore your compliance quickly. Contact us at totaldefence.ae/contact for a same-day assessment.

16. Can a dirty water tank damage my building’s pipes and pumps?

Yes — and this is a cost that catches many villa owners and building managers completely off guard.

The financial damage from a neglected water tank goes far beyond the health consequences. Sediment that accumulates at the bottom of a tank does not just sit there harmlessly — it gets drawn into the building’s pump system with every use cycle.

Just 1 centimetre of sediment in a tank reduces its effective capacity by 18%, putting strain on pumps that now work harder to maintain pressure. A 5mm buildup of sediment and corrosion accelerates pipe corrosion by 40%, leading to leaks, pressure drops, and eventual structural pipe failure.

Average repair costs for water-damage-related plumbing failures in Dubai buildings run to AED 8,700 and above — significantly more than the cost of preventive tank cleaning over the same period.

Rust particles from corroding metal tanks also damage pump seals, valve seats, and sensor components — leading to premature failure of expensive mechanical equipment that was designed to last decades.

The maths is straightforward: professional tank cleaning twice a year costs a fraction of a single major pipe repair or pump replacement. Prevention is always cheaper.

17. What does a professional water tank cleaning actually involve?

A proper Dubai Municipality-compliant water tank clean is a multi-step technical process — not simply spraying disinfectant inside a tank and calling it done.

Here is what Total Defence’s full cleaning process involves:

Step 1 — Isolation and drainage. The tank is isolated from the building’s water supply and fully drained. Depending on tank size, this takes 30 minutes to several hours.

Step 2 — Physical cleaning. Technicians enter the tank (or use long-reach equipment for smaller tanks) and manually scrub all internal surfaces — walls, floor, and ceiling. Accumulated sediment, biofilm, algae, rust deposits, and sludge are removed completely.

Step 3 — Pressure washing. All surfaces are pressure-washed with clean water to remove loosened debris and cleaning residue completely.

Step 4 — Disinfection. Dubai Municipality-approved disinfectant solution is applied to all internal surfaces at the correct concentration and contact time. This step kills remaining bacteria including Legionella, E. coli, and other pathogens.

Step 5 — Final flush. The tank is flushed thoroughly with fresh water to remove all disinfectant residue before the tank is returned to service.

Step 6 — Water quality testing. Water samples are tested for pH, total dissolved solids (TDS), free chlorine residual, and bacterial presence. Results are compared against UAE drinking water standards.

Step 7 — Certificate and documentation. A signed compliance certificate with the technician’s details, products used, test results, and the DM licence number is issued. This is your legal record for Dubai Municipality inspections.

Always ask any company you consider for their exact process. A company that cannot describe each of these steps in detail is not providing a compliant service.

18. How do I choose a Dubai Municipality-approved water tank cleaning company?

With dozens of companies offering tank cleaning in Dubai — many unlicensed or operating through WhatsApp with no verifiable credentials — knowing how to identify a legitimate provider is essential.

Here is what separates a genuine professional from an unreliable or illegal operator:

Valid Dubai Municipality licence number — ask for it before booking and verify it is current. Any hesitation or vague response about credentials is an immediate disqualification.

Proper equipment — professional tank cleaning requires confined space entry equipment, commercial pressure washers, calibrated water testing equipment, and approved disinfectant products. A technician arriving with a bucket and bleach is not performing a compliant clean.

Written certificate on completion — every legitimate clean ends with a signed, dated certificate showing the DM licence number, the products used, test results, and the name of the technician. No certificate means no compliance record.

Insurance — technicians entering confined spaces must be properly insured. Ask about coverage before allowing access to your tank.

Transparent process — a legitimate company will explain the full cleaning process before starting and answer every question without pressure.

Total Defence holds a valid Dubai Municipality licence for water tank cleaning and serves Dubai, Sharjah, and Ajman. Every clean includes full documentation, water quality testing, and a compliance certificate. Contact us for a free inspection or call (+971) 52 161 2380.

19. Does my villa need a water tank cleaning certificate too?

Yes — absolutely. No exemptions apply under Dubai Municipality regulations.

This is a common misconception among villa owners in areas like Jumeirah, Emirates Hills, Arabian Ranches, Mirdif, and Al Barsha. Because villas are privately owned and individually managed, many owners assume the regulations apply only to apartment buildings or commercial properties.

They do not. Every residential property in Dubai with a water storage tank — including single-family villas, townhouses, and compounds — is required to maintain a six-monthly cleaning and disinfection record.

For villa owners, the absence of a cleaning certificate creates additional personal liability exposure. If a family member or guest becomes ill from contaminated water and it is established that the tank had not been professionally cleaned, the villa owner bears direct responsibility.

Beyond legal compliance, villa tanks face additional physical risks. As covered in sections 8 and 9, villa rooftop tanks are exposed to more direct heat and sunlight than tanks in large buildings — making contamination rates higher and the health consequences of neglect more severe.

Do not assume your villa management company or HVAC maintenance contract includes tank cleaning — it typically does not. Confirm explicitly, ask for the certificate, and if one cannot be produced, arrange an immediate clean.

Our tank cleaning service covers all villa and residential tank types across Dubai and the wider UAE.

20. What to do after your water tank is cleaned

The clean is done — here is how to protect your investment and make the most of it:

Immediately after cleaning: Run every tap in the property for 2–3 minutes after the tank is returned to service. This flushes the first fill of freshly treated water through all pipes and removes any residual disinfectant from the line.

Keep your certificate safe: File your tank cleaning certificate where you can find it easily. Dubai Municipality inspectors can request it during routine building inspections, and you will need it if you are ever involved in a property dispute or insurance claim relating to water quality.

Set your six-month reminder: The single most effective step you can take right now is to add a calendar reminder for your next cleaning, exactly six months from today. Do not wait until symptoms appear or an inspection notice arrives.

Check your tank seals and lid: After cleaning, inspect the tank lid and access points for cracks, gaps, or missing seals. Contamination often enters through poorly fitted lids. A properly sealed tank stays clean significantly longer between services.

Watch for warning signs: In the weeks after cleaning, if water colour, taste, or smell deteriorates quickly, this indicates an underlying issue — a cracked tank, a contaminated inlet pipe, or a plumbing problem that is reintroducing contamination. Contact your cleaning company immediately.

Consider a maintenance contract: For villas and commercial properties especially, an annual maintenance contract that covers both cleaning visits, water quality testing between cleans, and priority scheduling is the most cost-effective way to stay permanently compliant without the administrative burden of booking separately each time.

Final word: your water tank is the most overlooked health risk in your Dubai home

Every day that a Dubai water tank goes uncleaned is a day that bacteria multiply, sediment accumulates, and the invisible health risk to your family or occupants grows. The good news is that it is entirely preventable — with a straightforward, legally required service that costs less than a single doctor’s visit.

Total Defence is a Dubai Municipality-approved tank cleaning and pest control company serving residents and businesses across Dubai, Sharjah, and Ajman. We offer:

Also protect your property from pests that breed in damp, uncleaned areas — learn more in our related guide on bed bug treatment in Dubai and our full pest control services page.

Ready to book? Contact Total Defence today or call (+971) 52 161 2380 for your free inspection.

Frequently Asked Questions

Q: How quickly can Total Defence respond for water tank cleaning in Dubai? A: We offer same-day and next-day appointments across Dubai, Sharjah, and Ajman. Call or WhatsApp (+971) 52 161 2380 for urgent bookings.

Q: Does Total Defence provide a cleaning certificate for Dubai Municipality? A: Yes. Every water tank cleaning includes a full compliance certificate with our DM licence number, technician details, water test results, and products used — formatted for Dubai Municipality inspections.

Q: Can Total Defence clean commercial and industrial tanks? A: Yes. We clean residential tanks, commercial tanks, underground tanks, sewage tanks, fuel tanks, grease traps, and industrial containers across Dubai and the wider UAE.

Q: Can I book water tank cleaning and pest control together? A: Absolutely. Many clients combine both services in a single visit for maximum convenience and cost efficiency. Visit our residential pest control page or building cleaning service for more.Q: What if my water tank fails the quality test after cleaning? A: If a water quality test reveals contamination after our clean, we return and re-service at no additional charge until the water meets UAE drinking water standards.

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