Easy Steps to Remove Algae from Plastic Water Tank

Algae growth in plastic water tanks can be a common problem for many homeowners. These green or brownish organisms not only make the water tank look dirty, but they can also affect the quality of the water stored inside. If left untreated, algae can multiply rapidly and cause clogging and unpleasant odors. However, with a few simple steps, you can effectively remove algae from your plastic water tank and prevent it from coming back.

1. Emptying the Water Tank

The first step in removing algae from a plastic water tank is to empty the tank completely. This will allow you to have better access to the interior surfaces of the tank and make the cleaning process more effective. After draining the tank, close the outlet valve to prevent any debris or algae from entering the pipes.

2. Scrubbing the Interior Surfaces

Once the tank is empty, you can start scrubbing the interior surfaces to remove the algae build-up. Use a long-handled brush or sponge soaked in a mixture of warm water and mild detergent. Scrub all the walls, corners, and the bottom of the tank thoroughly. Make sure to pay extra attention to areas where algae may be more concentrated.

3. Rinsing the Tank

After scrubbing, rinse the tank thoroughly with clean water. This will help remove any remaining algae and detergent residue. Use a hose or bucket to fill the tank with clean water and then drain it again. Repeat this process a few times until the water appears clear and free of any debris.

4. Disinfecting the Tank

To ensure that all traces of algae are eliminated and to prevent further growth, it’s important to disinfect the water tank. Mix a solution of chlorine bleach and water in a ratio of 1:10 (1 part bleach to 10 parts water). Pour the solution into the tank and fill it with water until the tank is about 80% full. Let the solution sit in the tank for at least 30 minutes to allow the chlorine to kill any remaining algae or bacteria.

5. Flushing and Refilling

After the disinfection process, flush the tank again by draining it completely. This will remove the chlorine solution and any remaining debris. Fill the tank with clean water and let it sit for a few hours to ensure that any residual chlorine evaporates. Test the water for chlorine levels before using it for drinking or other household purposes. It’s important to note that the water may not be suitable for consumption immediately after cleaning, so it’s advisable to wait until the chlorine levels are safe.

6. Regular Maintenance

To prevent algae from returning, it’s crucial to implement regular maintenance practices for your plastic water tank. Here are a few tips to keep in mind:

  • Keep the tank covered to prevent sunlight exposure, which promotes algae growth.
  • Clean the tank at least once every six months or more often if necessary.
  • Inspect the tank for any cracks or leaks and repair them promptly to avoid moisture build-up.
  • Use a water filter or purifier to ensure the water remains clean and free of impurities.


Removing algae from a plastic water tank can be a relatively simple process if done correctly. By emptying, scrubbing, and disinfecting the tank, you can effectively eliminate algae and maintain clean, safe water for your household needs. Remember to follow regular maintenance practices to prevent the recurrence of algae growth. With these steps, you can ensure the longevity and functionality of your plastic water tank.

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