How Often Should a Water Reservoir Be Cleaned and Disinfected?

A water reservoir that isn't maintained gradually becomes a source of contamination: sediment, scale, algae and biofilm build up on the walls and degrade the water quality of the entire building. Periodic cleaning and disinfection, followed by a water test, are the way to make sure the water reaching the tap is safe.

How Often to Disinfect

As a rule, a drinking-water reservoir requires cleaning and disinfection at least once a year, and in some buildings and institutions more frequently, depending on the requirements of the Public Health Regulations and the type of consumer. Buildings with a sensitive population or high water consumption will require more frequent maintenance.

Warning Signs That Call for Immediate Action

• A change in the taste, color or odor of the water.
• Turbidity or particles floating in the water.
• A drop in pressure or sediment at the bottom of the reservoir.
• A water test result that exceeds the threshold values.

What a Proper Disinfection Process Involves

An orderly process includes draining the reservoir, flushing and removing sediment, mechanically cleaning the walls and ceiling, disinfecting with an approved agent at the required concentration and contact time, and a final flush. Only then is a water sample taken for testing at an accredited laboratory to confirm that the reservoir has returned to proper function.

Documentation and Oversight

At the end you receive a cleaning and disinfection certificate alongside the water test report. Orderly documentation of treatment dates and test results spares you trouble during an inspection and lets you track trends over time. The Kesar Digum team performs the cleaning and disinfection, samples and delivers the samples to an accredited laboratory, nationwide.