What is rainwater harvesting, and why is it useful?

Rainwater harvesting is an eco-friendly and cost-effective way to save rainwater for non-drinking uses. The average home in the UK uses roughly 150 litres of water each day, but just 3% of that is used for drinking or cooking. Properly filtered rainwater can be used for all sorts of things such as toilet flushing, clothes washing, cleaning, and gardening.

With a properly installed rainwater harvesting system in the home, families are able to use up to 50% less treated water without any effect on hygiene or comfort.

Rainwater

The benefits of using rainwater at home:

  • More efficient washing, using up to 50% less washing detergent.
  • Lime scale and salt build-up is avoided in washing machines, toilets, baths, and sinks.
  • Plants love rainwater,so your garden will thrive on it!

How rainwater harvesting systems work

A rainwater harvesting system usually collects rainwater from the roof. Smooth surfaces like glazed concrete tiles will work best, although even ultra-eco green roofs will harvest 30 – 50% of rainfall. Whilst the water may look different from the drinking water we’re used to seeing, it is perfectly safe to use for toilet flushing, washing, and gardening.

Step 1: Filter

Rain is passed from the roof’s surface to the filter. The filter removes any dirt and other debris from the water, and as the water flows to the tank, the debris is washed away via the storm water pipe or a soak-away. 3P Technik rainwater filters are made with easily removable and cleanable stainless steel inserts compatible with a variety of systems.

Step 2: Calmed Inlet

The calmed inlet keeps life forms like bugs or algae from living inside the water tank. The rainwater, kept inside a dark and cool underground tank, is kept clean as any leftover particles fall to the bottom of the tank. The calmed inlet keeps any disturbance of these particles from occurring and ensures that oxygenated water is fed into to the lower levels of the tank, helping to keep the water fresh.

Step 3: Overflow Siphon

Pollens or other airborne particles less dense than water will float inside the tank. 3P Technik’s Overflow Siphon skims the surface of the water to remove these floating particles and ensure excellent long term water quality.

Step 4: Floating Pump Intake

Floating just beneath the surface of the water where the rainwater is at its cleanest, the Floating Intake takes water from the tank so that it can be used around your home and garden.

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