Uncle Tilo's Guide to Catchment Cleaning & Flushing House Lines

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Step 1: Catchment Cleaning Without the Hassle
Cleaning your catchment tank is crucial, but it's more than just dealing with the sediment at the bottom. The goal is to remove debris effectively without compromising the integrity of your tank. Here's how:
- Use the Siphon Method: Attach a swimming pool vacuum to a hose to siphon out debris. This method is most effective when your tank is more than ¾ full. The amount of water you'll need to remove depends on the sediment level, but always aim to conserve water by not draining the tank completely.
- Avoid Entering the Tank:** Never drain your tank to scrub the inside manually, especially if it has a vinyl liner. This approach wastes water and can damage the liner, shortening its lifespan.


Step 2: Disinfecting Your Tank
A clean tank is a healthy tank. A bleach treatment is your best friend to ensure your water is free from pathogens.
- Chlorine Treatment: Begin with a chlorine concentration strong enough to maintain a 3 ppm solution for at least two hours. This typically means starting with 6 ounces of bleach per 1,000 gallons of water. Stir the tank water to distribute the chlorine evenly.
- Choose the Right Bleach: Only use plain, unscented household bleach for this process. Test the water every 30 minutes, adding more bleach as needed to maintain the chlorine level, as chlorine tends to off-gas quickly.


Step 3: Flushing the House Lines
Once your tank is clean and disinfected, it's time to ensure that the cleanliness extends to your taps.
- Remove the Carbon Filter: Temporarily remove any carbon filters to allow chlorine to move freely through your house lines.
Run Your Water:** Open the taps at your kitchen and bathroom sinks, bathtubs, and outdoor faucets. Flush toilets, and don't forget to run a hot water laundry cycle. This helps remove sediment and disinfect the pipes.
- Let It Sit: Allow the chlorine to sit in the house lines for about 40 minutes. During this time, remove aerators from spigots to prevent clogging and ensure a thorough flush.


A Clean System Is a Happy System
By following these steps, you're not just cleaning your catchment system; you're ensuring the health and longevity of your water supply. Regular maintenance, including catchment cleaning and house line flushing, is essential for any rainwater harvesting setup. Uncle Tilo hopes this guide helps you keep your water clean, clear, and safe for all household uses. Remember, a little effort goes a long way in maintaining the quality of your water and the health of those who use it. Happy cleaning!

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