A technician washing the inside wall of a water tank with a pressure hose

Water tank cleaning in Wadi Jaleel Makkah

Wadi Jaleel is a mountain valley district in Makkah's north east where new housing schemes are rising on the floor of an old flood watercourse. The valley drains heavy flash floods when rain falls, and the tanks here are new but construction continues all around them. Each rainy season brings powerful floods that threaten the tanks and the pipes they feed, and the structural stress is constant.

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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 Wadi Jaleel

Tanks in the new scheme face vibration from neighbouring construction machinery and fluctuating pressure from newly laid pipelines that are still being tested. The method is set out in full on the full Water tank cleaning page.

The first reason

An ancient watercourse runs beneath the foundations

Wadi Liyyah is a natural channel and millennia of floods have carved it deep. The new scheme was built over this natural watercourse, and powerful seasonal floods flow beneath the tanks and pipes and undermine the ground.

The second reason

Construction machinery vibration causes rapid cracking

Heavy machinery shakes the ground and the tank concrete is still fresh and has not fully set. Vibration causes hairline cracks to form quickly and pressure on new pipes fluctuates constantly as work progresses.

The third reason

Groundwater rises fast in the rainy season

Wadi Jaleel is a natural water collection point and groundwater rises rapidly when rain falls. The tank can find itself surrounded by water rising from below, and cleaning must be done before the rains arrive.

Wadi Jaleel on the map

Wadi Jaleel sits about 3 km from Qurtubah and about 3.5 km from Jabal Al Noor.

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Before treatment

The condition of the tank decides the method

The wadi falls from the hills to the north east of the city, ground is damp when rain comes and groundwater sits close to the surface, and building work continues while the earth beneath has not yet settled.

Fine brown sediment beneath shallow water

The layer on the floor

Fine construction sand and wadi sediment accumulate on the floor at speed, and new tanks may look clean but sand enters constantly from the air.

Light and algae

Light enters through openings and algae can grow quickly in new tanks that are not yet fully sealed or protected.

A damp concrete wall carrying a dark deposit

The deposit on the wall

New concrete may be very porous at first, and deposits build up quickly on rough fresh surfaces.

A concrete surface with a fine hairline crack

The lining and hairline cracks

New concrete may contain cracks from shrinkage and vibration, and hairline cracks can widen rapidly under flood pressure.

The lid of a water tank on a building roof

The lid and the access hatch

Covers are new metal but maintenance hatches may not be well protected against dust and rain ingress.

A plastic pipe leaving the exterior wall of a building

The vent and the overflow pipe

Ventilation may not be complete in new tanks, and overflow pipes may be temporary or unprotected against dirt entry.

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.

The character of Wadi Jaleel

New development: ongoing construction and vacant plots between the homes

A new scheme means construction is ongoing and heavy machinery shakes the ground while the tank concrete is still setting. Cracks form very quickly, and construction dust enters the tank from everywhere.

Questions about this district

Do floods pass directly beneath the tank underground?

Yes, the old Wadi Liyyah channel runs beneath the scheme. Seasonal floods rush through with great force, and the tank and pipes can shift slightly under the pressure from below.

Does ongoing construction affect water quality?

Yes, dust and sand from building sites enter the tank easily. New pipes may also carry construction material, and water can stay cloudy in the early months of use.

Are small vibration cracks in new tanks dangerous?

They can be very dangerous indeed. Hairline cracks can widen under changing pressure, and groundwater can seep in through them during the rainy season.

When should a new scheme tank have its first cleaning?

First cleaning should happen before real use starts, and before the rainy season arrives. Later cleanings may be needed more often than in other areas because construction continues to disturb the surroundings.

Should the tank structure be inspected after cleaning?

Yes, checking for cracks and leaks is essential. Cleaning work can reveal cracks that were not visible before, and they may need sealing before the rains arrive.

Will water stay clean after cleaning when construction continues around the tank?

It is very difficult. Dust, sand and construction material keep entering the tank continuously. Cleaning may need to be repeated more often than in quiet, completed neighbourhoods.

How much does water tank cleaning in Wadi Jaleel 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 Wadi Jaleel.