How to Clean a Rainwater Tank?

Cleaning a rainwater tank typically involves draining the tank and removing sediment buildup. Here's a breakdown of the common methods:

Cleaning Methods

The best method depends on the size of your tank and the amount of sediment.

1. Vacuuming (For All Tank Sizes)

This method is generally recommended as it's safer and more efficient for most tank sizes.

• Process:
  • Use a submersible pump and hose to vacuum the dirty water and sediment from the bottom of the tank.
  • Ensure the pump is powerful enough to lift the sediment.
  • Dispose of the dirty water appropriately, away from waterways.

2. Manual Cleaning (For Larger Tanks You Can Enter - Use Extreme Caution)

WARNING: Entering a tank can be dangerous due to lack of oxygen, slippery surfaces, and potential for collapse. If you are not experienced and comfortable working in confined spaces, hire a professional.

• Process:
  1. Drain the Tank: Drain as much water as possible from the tank.
  2. Enter the Tank (with caution!): If the tank is large enough to safely enter, and you are comfortable doing so, enter the tank. Ensure proper ventilation and a second person outside for safety.
  3. Hose and Sweep: Use a hose and broom or brush to sweep out the remaining sediment towards the drain point.
  4. Rinse: Rinse the tank walls to remove any remaining debris.
  5. Disinfect (Optional): You can disinfect the tank with a chlorine solution (follow product instructions carefully) and rinse thoroughly afterwards.
  6. Refill: Allow the tank to refill with rainwater.

Important Considerations

• Safety First: Always prioritize safety. Confined space entry requires specific precautions. If you're unsure, hire a professional.
• Sediment Disposal: Dispose of the removed sediment properly, away from waterways and sensitive areas.
• Regular Maintenance: Regular tank inspections and cleaning (every 2-3 years, or more frequently if necessary) will help maintain water quality.
• First Flush Diverters: Install first flush diverters on your downpipes to prevent the dirtiest water from entering the tank.
• Tank Screens: Use tank screens and leaf eaters to keep debris out of the tank.

By following these guidelines, you can effectively clean your rainwater tank and ensure a clean and reliable water supply.