How Often Should You Clean Your Water Tank? A Saudi Guide

The Short Answer: Twice a Year

We recommend cleaning household water tanks at least twice a year, every six months. That rhythm suits most Saudi homes and helps keep the water clean and the tank in good shape.

According to the UK Health and Safety Executive, a cold water storage tank should have a tight-fitting lid and be checked at least once a year to make sure it stays clean. That yearly check is a minimum; a full wash twice a year goes beyond it to allow for the Eastern Province's heat.

Why Wash a Tank Every Six Months?

Because three things build up in a tank between washes: bacteria and algae fed by heat, sediment that hardens at the bottom, and dust that gets into poorly sealed tanks.

Heat Drives Bacterial and Algal Growth

The single biggest factor isn't dust; it's heat. In the Eastern Province, tank water can sit warm for months. Warm water can encourage the growth of bacteria and algae. Even sealed tanks can develop a film on the walls in long, hot stretches.

Sediment Settles and Hardens

Over time, fine particles in your water (minerals, traces from old pipes, anything that slipped past inlet filters) settle at the bottom. According to the UK Health and Safety Executive, deposits such as rust, sludge and scale can support bacterial growth by providing a source of nutrients. The longer they sit, the harder they get to remove. A six-month cleaning cycle catches them before they cement.

Dust: A Secondary Factor That Depends on Sealing

Dust matters most for older or poorly-sealed tanks, where fine particles can work their way in through gaps around the lid. A well-sealed tank keeps most of it out. After a big storm, a quick visual inspection is worth doing; if water looks fine and the lid is intact, you don't need to rush a cleaning.

When You Might Want a Third Cleaning

• Heavy household use (large families, frequent guests)
• A sun-exposed rooftop tank that gets especially warm
• An older or poorly-sealed tank
• Visible signs in the water (yellowing, smell, sediment in tap filters)

Signs You Should Book Sooner

• Yellow or cloudy water from the taps
• An unusual smell when you fill a glass
• Sediment showing up in tap aerator filters
• Visible film or residue in kitchen utensils

Does a Fibreglass Tank Need Less Cleaning?

No, a fibreglass tank needs the same schedule: twice a year. It does not rust, but sun exposure weakens seals over time. According to the World Health Organization, sunlight that reaches stored water promotes algal growth. If light gets into the tank, algae can still grow on its inner walls.

How often should a ground tank be washed?

A ground tank needs the same twice-a-year wash, and the technician inspects it visually at every visit because it sits against soil and groundwater. If cracks or a leak are found, waterproofing for the ground tank starts from ⃁ 1300 with a written 5-year warranty issued by your provider, which Zabbitna requires from every waterproofing provider and keeps a copy of. The warranty stays valid while the tank is washed every 6 to 12 months with proof kept, and at least one of those washes each year is booked through Zabbitna.

Protect your family's water with a professional clean: book a tank cleaning with food-grade chlorine safe for drinking water and a written report after every service.

Sources

• Hot and cold water systems: things to consider, UK Health and Safety Executive.
• What Legionnaires' disease is and typical symptoms, UK Health and Safety Executive.
• Guidelines for Drinking-water Quality, 4th edition, chapter 6, World Health Organization.