How to Safely Clean and Sterilize Your Caravan or Motorhome Water Tank?
- IDS Camping & Leisure
- Feb 13, 2025
- 4 min read
Updated: Mar 12
Maintaining a clean and sterile water system in your caravan or motorhome is essential for ensuring safe water usage during your travels. Over time, water tanks and pipes can harbor bacteria, biofilm, and other contaminants that pose health risks. Regular cleaning and sterilization help prevent these issues, ensuring that your water remains fresh and safe.
Why Regular Cleaning is Important
Stagnant water in tanks can become a breeding ground for bacteria such as Legionella and E.coli. Even if you don't drink directly from the tank, using contaminated water for washing or showering can still pose health risks. Regular maintenance prevents the buildup of harmful microorganisms and biofilm, which can affect water quality and safety.
Step-by-Step Guide to Cleaning and Sterilizing Your Water System
Drain the System: Begin by draining all water from your tanks and pipes. Open all taps, including the shower, to ensure the system is empty.
Prepare a Cleaning Solution: Use a specialized cleaner like Purisol, which is designed for caravan and motorhome water systems. Avoid household products like bleach or Milton, as they can damage components.
Fill the System with the Solution: Mix the cleaner according to the manufacturer's instructions and fill your water tank with the solution. Pump it through all taps until the solution is distributed throughout the system.
Let It Sit: Allow the solution to sit in the system for the recommended time, usually between 1 to 12 hours, depending on the product used.
Flush the System: After the soaking period, drain the cleaning solution and thoroughly flush the system with fresh water. Repeat the flushing process multiple times to ensure all residues are removed.
Replace Filters: If your system uses water filters, replace them after cleaning to ensure optimal water quality.
Recommended Products
For effective cleaning and sterilization, consider using products specifically designed for caravan and motorhome water systems. Purisol is a popular choice among enthusiasts.
Additional Tips
Regular Maintenance: Sterilize your water system at least once per season. If your vehicle is unused for extended periods, clean the system before your next trip.
Avoid Household Cleaners: Products like bleach or vinegar are not recommended, as they can damage the system and may not effectively remove biofilm.
Inspect Regularly: Regularly check your water system for signs of contamination, such as unusual odors or tastes, and clean as necessary.
By following these steps and using appropriate products, you can ensure that your caravan or motorhome's water system remains clean and safe, providing you with peace of mind during your adventures.
Common Mistakes When Cleaning a Caravan or Motorhome Water Tank
Cleaning your water system is straightforward, but a few common mistakes can reduce effectiveness or even damage your system.
Not using the correct cleaner
Household cleaners or strong bleach can damage seals and pipes in your caravan or motorhome water system. Always use a cleaner designed for caravan water systems such as Puriclean.
Forgetting to clean the Aquaroll or water container
Even if your onboard water system is clean, bacteria can still build up in water containers. Make sure your Aquaroll or fresh water container is cleaned and sterilised at the same time.
Not flushing the system properly
After using a water tank cleaner, the system should always be flushed with fresh water. Leaving residue in the system can affect the taste of your drinking water.
Only cleaning the system once a year
Ideally your water system should be cleaned:
• at the start of the season
• after long storage
• if water has been sitting in the system for long periods
Regular cleaning helps prevent bacteria and algae build-up.
Plan Your Next Trip With Our Touring Guides
Keeping your caravan or motorhome water system clean is just one part of preparing for a great trip. Our touring guide series covers everything from campsite setup and arrival routines to travel tips for beginners.
Explore the full guides:
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Common Mistakes When Cleaning a Caravan or Motorhome Water Tank
Cleaning your water system is straightforward, but a few common mistakes can reduce effectiveness or even damage your system.
Not using the correct cleaner
Household cleaners or strong bleach can damage seals and pipes in your caravan or motorhome water system. Always use a cleaner designed for caravan water systems such as Puriclean.
Forgetting to clean the Aquaroll or water container
Even if your onboard water system is clean, bacteria can still build up in water containers. Make sure your Aquaroll or fresh water container is cleaned and sterilised at the same time.
Not flushing the system properly
After using a water tank cleaner, the system should always be flushed with fresh water. Leaving residue in the system can affect the taste of your drinking water.
Only cleaning the system once a year
Ideally your water system should be cleaned:
• at the start of the season
• after long storage
• if water has been sitting in the system for long periods
Regular cleaning helps prevent bacteria and algae build-up.
FAQs
How often should I clean my caravan water tank?
Most caravanners clean and sterilise their water system at least once at the start of each touring season, and again if the caravan has been unused for several months.
Can I use bleach to clean my caravan water system?
While some people use diluted bleach, specialist products such as Puriclean are recommended because they are designed specifically for caravan and motorhome water systems.
Do I need to clean my Aquaroll as well?
Yes. The Aquaroll or water container should always be cleaned at the same time as the caravan water system to prevent contamination.
How long should I leave the cleaner in the system?
Most water system cleaners should remain in the system for several hours to fully sanitise pipes, tanks and pumps. Always follow the instructions on the product packaging.
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