A technician washing the inside wall of a water tank with a high pressure hose
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Water tank sterilization in Al Ruwais Jeddah

Al Ruwais is an old coastal district west of Madinah Road, with ageing apartment blocks standing beside newer buildings. Water tanks in old buildings have accumulated sediment and algae for years, and water travels through long pipes from the tank to upper-floor units. Sterilization here requires understanding the old building infrastructure and ensuring every corner and pipe is clean.

  • Potable-rated materials

    Linings and disinfectants cleared for drinking water tanks, not general-purpose products.

  • You get the downtime first

    How many hours the tank is out of service, told before we start rather than after we finish.

  • A first-draw flush

    We run the first draw off after refilling, and the tank is not handed back until the water runs clear.

  • Ground and roof tanks

    Villas, apartment blocks and premises that need a written record of each visit.

Why the job is different in Al Ruwais

Buildings here date from the 1980s and 1990s, and overhead tanks have endured direct sun and high coastal humidity for decades. The method is set out in full on how we approach Water tank sterilization.

The first reason

Overhead tanks exposed to sun and coastal humidity

High coastal humidity accelerates algal and bacterial growth on tank walls. Direct sun heats the tanks, speeding microbial colonisation.

The second reason

Long pipe runs from tank to upper floors

Old apartment blocks house units on very high storeys. Delivery pipes are long and water moves slowly, allowing sediment and iron compounds to settle inside the pipework.

The third reason

Iron deposits from ageing metallic pipes

Old metal pipes corrode from inside and iron particles settle on the tank floor. These deposits create an environment for aerobic bacteria to thrive.

Landmarks of Al Ruwais

Al Ruwais sits west of Madinah Road near the Corniche, with clear boundaries marked by major landmarks, lively streets and well-known public facilities.

  • Hail Street
  • Madinah Road
  • International Medical Center
  • Haifa Mall
  • Al Ruwais Park
  • Al Ruwais Mosque
Before treatment

What we read inside the tank before anything starts

An established residential quarter on the coast west of Madinah Road, with mid-rise apartment blocks, commercial centres and Al Ruwais Park. It is bordered by Al Hamra on one side and Al Sharafiyah on the other.

Fine wet sand seen close up

Sediment on the floor

White and brown sediment accumulates on the tank floor from old metal pipes and dissolved minerals in the water.

A concrete wall carrying a damp green layer

The slime film on the wall

Green and oily algae coat the tank walls due to sun exposure and very high coastal humidity.

A plastic water tank standing on a rooftop

Light and heat

Long pipe runs from tank to upper units collect deposits and restrict water flow.

A concrete surface carrying fine cracks

The lining and any cracking

Internal humidity is very high and condensation forms on tank walls especially at dawn and dusk.

A metal cover over a water tank opening

The lid and the openings

The overhead tank faces direct sun from morning to afternoon, heating the water and accelerating biological growth.

A glass of water on a kitchen counter

What shows up at the tap

Aerobic and anaerobic microbes multiply rapidly in a tank exposed to both sun and high humidity.

How we work

  1. 1

    Inspect and record the condition

    We open the hatch and work through what the tank is made of and how big it is, how deep the sediment lies, the state of the lining, whether the lid and the overflow seal, and whether there is a crack that has to be repaired before any sterilizing.

  2. 2

    Drain and lift the sediment out

    The water goes out, then the silt and sand are lifted off the floor by suction rather than pushed toward the outlet, because pushing them sends them into the house pipework and the heater.

  3. 3

    High pressure wash

    Walls, floor, corners and the area around the outlet, until the slime film is completely gone. This is the step that makes the sterilizing after it mean anything.

  4. 4

    Sterilize, rinse, then return to service

    The sterilizing agent goes onto the walls, the floor and the underside of the lid and is left for its contact time, then we rinse, refill and run the furthest tap until the whole line is clear.

What water tank sterilization includes

  • A technician inspecting with a flashlight

    A recorded inspection

    Material, capacity, sediment depth, the state of the lining, the lid and the overflow, all before any work begins.

  • A metal floor drain

    Draining and sediment removal

    The water out, and the silt and sand lifted off the floor instead of being pushed into the outlet and the house pipework.

  • A spray nozzle in close detail

    High pressure washing

    Walls, corners and around the outlet, until the biofilm that no disinfectant penetrates has gone.

  • A spray nozzle in close detail

    Sterilizing the internal surfaces

    A sterilizing agent meant for drinking water tanks, applied to the walls, the floor and the underside of the lid, and left for its contact time.

  • A clean kitchen counter after treatment

    Line flush and aftercare

    Rinse, refill and a flush from the furthest tap, when the water is usable again, and what to change in the filter afterwards.

  • The visit report being written on a clipboard

    The next cycle

    We agree the right interval for your tank from how it is filled, how much sun it takes and the condition of the lid.

What is different about Al Sharafiyah Sub-Municipality

The Al Sharafiyah sub municipality runs across central Jeddah from Al Ruwais near the Corniche eastwards through Al Sharafiyah, Al Wurud and Bani Malik to Al Naseem at the Haramain Road. It was among the first areas to grow beyond the old wall, and it is dominated by dense apartment blocks over shops along King Fahd Road and Palestine Street, with old popular quarters, the Bani Malik market, car workshops and storerooms. Ageing buildings, worn drainage and the refuse of restaurants and markets make cockroaches and rodents the most persistent pests, and humidity rises towards the sea.

Questions about this district

Why is the water red or brown in Al Ruwais?

Old metal pipes corrode internally and release iron particles. Sterilization alone will not fix it unless the pipes are replaced or internally coated.

Is annual sterilization enough for coastal tanks?

High coastal humidity encourages rapid algal growth. Al Ruwais tanks may need sterilization every six months, especially during high-humidity seasons.

What is the difference between tank washing and sterilization?

Washing removes sediment and visible algae from tank walls. Sterilization kills bacteria and viruses that remain even after washing.

Is the water safe to drink immediately after sterilization?

Yes, after the tank and pipes are flushed with clean water. But if pipes are corroded, additional flushes may be needed.

How does treatment of an overhead tank differ from a ground tank?

The overhead tank is exposed to direct sun and coastal humidity, so it needs stronger sterilization. The ground tank is cooler and less exposed but may accumulate more sediment.

Does chlorine smell remain after sterilization?

A faint smell may linger. Proper flushing and regular tap use will remove the odour within hours.

How much does water tank sterilization in Al Ruwais cost?

It is set after the inspection, because the price follows the type of infestation, the size of the space, how far it has spread and the number of visits it needs. Send a photo and a description on WhatsApp and we will give you an estimate before we reach Al Ruwais.

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We reach Al Ruwais at a time we agree, and you get the full cost before we start.

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