Water tank cleaning in Harat Al Zanabiqah, Jeddah

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 Harat Al Zanabiqah

Tanks here sit under constant sea humidity and salt air pressure, so the wall film is thicker and more stubborn than tanks in other Thuwal quarters. The method is set out in full on what Water tank cleaning involves.

The first reason

High humidity and salt penetrate the tank continuously

Coastal location means year round damp and airborne salt crystals. These enter through vent holes and fine cracks in the tank body. Salt deposits layer on walls and mix with algae to form a hard composite film.

The second reason

Algae growth accelerates in light and high humidity

Coastal districts catch long hours of direct sun and constant moisture, which accelerates algal growth. Light reaches the tank if the lid sits ajar or if hairline cracks admit sunlight through the shell.

The third reason

Salt corrosion causes slow leaks in older tanks

Salt causes slow electrochemical corrosion of metal and concrete. Hairline fractures may appear weeks after cleaning and gradually widen into small weeps, which raises humidity around the tank and the surrounding walls.

The character of Harat Al Zanabiqah

Coastal area: high humidity and salt air through the year

The coastal setting means every part of the tank faces salt and humidity. Salt enters the air supply and humidity from the sea permeates the shell. Cleaning must target salt removal as much as algal biofilm.

Before treatment

The condition of the tank decides the method

A coastal quarter where homes meet the university fence on one side and the open beach on the other, exposed to seaborne humidity and salt aerosol throughout the year.

Fine brown sediment beneath shallow water

The layer on the floor

Sediment here contains seaborne salt minerals mixed with ordinary water sediment. The floor layer is more saline than in inland quarters and may have a crystalline texture.

Light and algae

Algae growth is rapid because high humidity and direct sun combine with salt minerals that provide extra nutrients for biofilm. The coastal microclimate supplies all conditions for accelerated algal bloom.

A damp concrete wall carrying a dark deposit

The deposit on the wall

Wall deposits are thick and hard, a composite of salt crystals, algae and bacterial biofilm. This caked layer requires very high pressure and strong disinfectant to lift.

A concrete surface with a fine hairline crack

The lining and hairline cracks

Hairline cracks can develop because salt causes slow swelling and shrinkage of the tank material. Cracks may grow slowly but will eventually need sealing or tank replacement.

The lid of a water tank on a building roof

The lid and the access hatch

The lid may be sealed but salt deposits gather at the gasket seams and salt air seeps past them. The maintenance hatch and hinges need frequent cleaning to remain airtight.

A plastic pipe leaving the exterior wall of a building

The vent and the overflow pipe

The vent hole admits salt crystals directly, and the overflow discharge can contain salty water if mineral concentration rises from wall deposits.

How we work

1
Inspect before the drain

Tank type and material, the condition of the lining, the depth of the sediment, the lid and the vent, and where the drained water will go. We agree the window without supply before anything is opened.
2
Drain, then lift the sludge

The water leaves through the outlet, then the layer beneath it is taken out by hand and by suction. That layer is the reason for the visit, not the water that ran out ahead of it.
3
High pressure wash

Walls, floor and the joint where they meet, with a brush wherever the film resists, then the wash water is taken out completely so nothing we lifted settles again.
4
Disinfect and put back in service

Disinfectant over every internal surface, left for its contact time and then rinsed out, followed by the refill, a first draw off at the taps, and a report on what was inside the tank.

What water tank cleaning includes

An inspection before the valve

Tank type, lining condition, depth of sediment, lid and vent, recorded before any water leaves.
Full drain and sediment removal

The water through the outlet, and the layer below it by hand and by suction until the floor itself is showing.
Pressure washing walls and floor

High pressure across the surfaces and corners, and a brush on anything water alone will not lift.
Disinfection after the wash

A disinfectant intended for drinking water tanks, named to you before it is used, left for its contact time and then rinsed out.
Refill and the first draw off

We refill, run the taps so the new water moves through the pipework, and tell you when it is ready to use.
A report and the next date

What was inside the tank, anything on the lid or the lining that needs repair, and a sensible date for the next clean.

Landmarks of Harat Al Zanabiqah

Harat Al Zanabiqah runs along the Thuwal Corniche with the King Abdullah University campus to the north. We reach tanks via streets near the waterfront where homes stand directly beside the beach.

King Abdullah University of Science and Technology
Thuwal Corniche
Al Shati Mosque

Questions about this district

The tap water smells directly of sea salt. Where does it come from?

Salt can enter through vent holes, hairline tank cracks or via corroded pipes. Cleaning and disinfecting will eliminate the smell, but we carefully inspect all openings and seals.

Our tank weeps small droplets from the walls. Is this sea salt damage?

Salt and humidity cause slow corrosion of the tank shell. Hairline weeps can appear and stay stable, but we pressure wash the outside, check the cracks and seal them if they threaten to enlarge.

Do algae grow faster in Al Zanabiqah than other Thuwal quarters?

Yes, coastal position and high humidity accelerate algae growth. The light, moisture and nutrient load here exceed inland norms. Tight lids and regular cleaning are essential.

The water turns cloudy after the tank sits idle over a holiday. Why?

Standing water in humid air favours bacterial bloom and algae growth. The water may be microbiologically clean but fine suspended algae cloudier it. Full tank cleaning and disinfection followed by fresh fill is better than leaving it empty.

Can we protect the tank from sea air between cleanings?

A tight lid and sealed vent holes reduce salt and humidity ingress. We inspect for cracks and seal them, and service the inlet filter regularly. But the coastal location means high humidity will always be a factor.

Should we replace the tank instead of repeated repair here?

If the tank is very old and leaks recur, replacement may cost less than repeated repairs. A new tank resists salt better, but routine cleaning remains essential regardless of tank age in this coastal setting.

How much does water tank cleaning in Harat Al Zanabiqah 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 Harat Al Zanabiqah.