top of page
  • Writer's pictureDavid Bennett

Cleaning your water tank

A water tank is a vital component of any water supply system, whether it's for domestic use, agriculture, or industrial purposes. To ensure the water stored in the tank remains clean and free from harmful bacteria, regular chlorination is essential. Chlorination is a widely used method for disinfecting water tanks, effectively killing bacteria, viruses, and other microorganisms that may be present. In this blog, we will discuss the step-by-step process of chlorinating a water tank to maintain water quality and promote public health.


Step 1: Preparing for Chlorination


Before starting the chlorination process, gather the necessary materials and equipment. You will need:


- Chlorine solution: Use a chlorine-based disinfectant that is suitable for water treatment. The concentration and dosage will depend on the size of the tank and the water volume it holds. Follow the manufacturer's instructions for the correct dosage.


- Safety equipment: Wear appropriate protective gear, including gloves, goggles, and a mask, to avoid direct contact with the chlorine solution.


- Cleaning supplies: Ensure the tank is clean and free from debris or sediment. If needed, use a brush and mild detergent to scrub the interior surfaces of the tank. Rinse thoroughly to remove any residue.


Step 2: Calculating the Dosage


To determine the correct dosage of chlorine solution for your water tank, consider factors such as the tank's capacity, the volume of water it holds, and the desired chlorine residual. It is recommended to consult with a water treatment professional or refer to local guidelines for specific dosage recommendations.


Step 3: Mixing the Chlorine Solution


Follow the instructions provided by the chlorine solution manufacturer to prepare the correct concentration of chlorine solution. Typically, this involves diluting the chlorine concentrate with water in a separate container. Ensure proper ventilation during the mixing process.


Step 4: Adding Chlorine to the Water Tank


Carefully pour the prepared chlorine solution into the water tank. Use a long-handled dipper or a pump to distribute the solution evenly throughout the tank. Make sure the entire interior surface of the tank is exposed to the chlorine solution.


Step 5: Circulating the Chlorine Solution


To ensure thorough mixing and contact time, circulate the chlorine solution within the tank. This can be done by operating the tank's agitator or recirculation system. If the tank does not have these features, you can manually circulate the solution using a pump or by periodically opening and closing the tank's outlet valve.


Allow the chlorine solution to remain in contact with the tank surfaces and water for the recommended contact time. This can vary depending on the dosage and desired disinfection level. Typically, a contact time of several hours to overnight is recommended.


Step 7: Flushing and Testing


After the contact time has elapsed, flush the tank by opening the tank's outlet valve and allowing the chlorinated water to flow out. Ensure the water is discharged to a suitable location, such as a drain or an area where it will not harm the environment.


Once the tank has been flushed, test the water for residual chlorine levels using a chlorine test kit. The residual chlorine level should be within the recommended range specified by local guidelines or water treatment standards. If the chlorine level is too low, repeat the chlorination process.


Step 8: Refilling the Tank


After confirming the desired residual chlorine level, refill the tank with fresh water from a clean and reliable source. This water will be treated with the residual chlorine, providing ongoing disinfection and maintaining water quality within the tank.


Step 9: Post-Chlorination Maintenance


Regularly monitor the water quality in the tank by testing for chlorine levels and conducting periodic water quality analyses. This will help ensure that the disinfection process is effective and that the water remains safe for its intended use.




Chlorination is a critical step in maintaining clean and safe water within storage tanks. By following the proper procedures for chlorinating a water tank, you can effectively disinfect the tank and protect against harmful bacteria and microorganisms. Regular maintenance and testing are essential to ensure ongoing water quality and public health. Remember to always follow local guidelines, consult with professionals if necessary, and prioritize safety when working with chlorine solutions. With proper chlorination practices, you can ensure a reliable and safe water supply for your needs.


Written by Chatsonic

23 views0 comments

Recent Posts

See All

Karst: Environment and Management of Aquifers

A new book "Karst: Environment and Management of Aquifers" has been published by the Groundwater Project and is available as a free download at:


bottom of page