Rainwater harvesting is an environmentally friendly and cost-effective way to store water for non-consumption purposes. The average household in the UK uses around 150 litres of water per day, just 3% of which is for human consumption. Properly filtered rainwater is perfectly suitable for use in toilet flushing, clothes washing, cleaning, and gardening.
With a properly implemented rainwater harvesting system in place, it is possible to use up to 50% less treated water without any effect upon levels of hygiene or comfort. rainwater harvesting is a sustainable solution to rainwater management challenges
The 3P Technik rainwater harvesting system – Four steps to clean water:
A rainwater harvesting system ordinarily collects water from the roof. A smooth surface such as slate or glazed concrete tiles will work best, whilst green roofs will harvest 30 – 50% of rainfall. Whilst the appearance of the water may differ slightly from that of drinking water, it is perfectly safe for use in toilet flushing, in the washing machine, and for garden irrigation.
Step 1: Filter
Rain flows from the roof to the filter, which separates leaves and other debris from the water. As the water flows to the tank, the debris is washed to the storm water system or to a soak-away. 3P Technik rainwater filters are complete with easily removable and cleanable stainless steel inserts compatible with various systems. Removing the biological load to a RWH tank allows the underground tank to self sterilise.
Step 2: Calmed Inlet
The filtered rainwater, now stored in a dark and cool underground tank, remains clean. Residual particles denser than water settle at the bottom of the tank. The calmed inlet prevents the disturbance of this layer of sedimentation and it also ensures that oxygenated water is introduced to the lower levels of the tank, keeping the water fresh. Ensure your system provider fits a Calmed Inlet.
Step 3: Overflow Siphon
Residual particles, such as pollens or other airborne particles which are less dense than water will float inside the tank. 3P Technik’s expertly designed Overflow Siphons provide for a skimming of the water when it overflows the RWH tank. This promotes the removal of this floating layer, preventing souring of the water, and ensuring optimum long term water quality. Ensure your system provider fits an independent overflow. Overflow back through the filter traps floating layers, leading to long term problems.
Step 4: Floating Pump Intake
Floating just beneath the water’s surface where the rainwater is cleanest, the 3P Floating Intake draws water from the tank for use in its various applications. The Floating Pump is supported by a durable plastic ball float and features an additional filter and check valve.
The benefits of using rainwater at home:
- Reduces stormwater runoff.
- Saves scarce drinking water supplies, valuable with climate change inputs that are coming to the UK.
- More efficient powder consumption in washing machines, using up to 50% less washing detergent;
- Build-up of lime scale and salt is avoided in washing machines, toilets, baths, and sinks;
- Plants thrive on rainwater, gardens, pets and plant will benefit from the non-chlorinated waters.