Treated Rainwater to Augment Mains Supply


On 16th August 2014, in the NewScientist magazine, it was written...

“Clean water is the most basic of necessities…

Just as the future of Electricity is seen by some to lie with a decentralised network of small scale producers, the way to lessen water woes in countries across the globe could be for each of us to take charge of our own water treatment ourselves. It is a bold vision…

Leaky pipes are expensive to fix, but also a health hazard…

The most likely move in the developed world is not a wholesale switch to off grid water but some sort of hybrid solution…

…Old, patched up pipes continuing to distribute water in the volumes we demand, but treated to a lower standard. At local treatment facilities, it would undergo further treatment to bring it up to par.”


DEFRA to advocate a new Technology that treats harvested rainwater to potable standard.

This technology has been developed and patented by RainSafe Water and is available in the UK from a network of qualified British installers.

All buildings could be encouraged to install rainwater harvesting tanks with mains supply back-up connection (with air-gap) into the harvesting tank. Treated rainwater (using the new technology) can augment municipal supply. This treated rainwater can become the primary source of water with municipal supply used only as a back-up in drought situations.

The RainSafe would treat and continuously monitor the quality of treated water and enable harvested water and municipal water to be joined and re-treated to potable standard at the point of use. This negates the need for second piping networks to be installed within buildings where harvested rainwater is used. Accordingly, it Rainwater Harvesting becomes more financially attractive and easier to install.

Heavy rains causing flooding and mayhem in winter followed by water rationing in summer time would become a memory from the past. 

The critical and ever shortening surplus between supply and demand, described recently at The Geological Society by Ian Barker (formerly Head of Water, Land & Biodiversity at The Environment Agency) can be proactively addressed in a way that can mitigate winter flooding and summer rationing risks.

If DEFRA can advocate this alternative decentralised supply, dependency on municipal supply will be reduced leading to savings in carbon emissions (less pumping) and delivery of safer water (less chemical usage and treatment).

As the RainSafe treats, monitors and meters water as its being consumed opportunities to optimise water production levels become possible.


  • Climate change simultaneously creates UK flood events followed by drought induced water shortages
  • UK water supply is coming under growing pressure
  • Leakages in UK water supply cause losses in excess of 3.3 Billion litres annually
  • Increasing UK water availability lessens UK's exposure to global water war / shortage threats
  1. SAO PAOLO (Brazil) -
  2. GERMANY -
  4. INDIA -'s-how-low-Delhi's-water-table-has-fallen
  5. NO WATER IN INDIA BY 2040 -


  1. Above ground rainwater harvesting tanks are installed in domestic and commercial buildings
  2. Wherever rainwater harvesting is installed - RainSafe system(s) are co-joined to turn the harvested rainwater into potable, treated water
  3. Water Utility companies pump water at lower pressure into piping networks (thereby saving energy (pumping) costs, cutting carbon emissions and reducing pressure induced leakages)
  4. Water Utility companies reduce levels of chlorination of mains supply as the RainSafe will provide treatment at point of use (thereby saving chemical costs, promoting sustainability and promoting better health - considering the health risks associated with chlorination)
  5. Water Utility Companies can be encouraged to meter water users according to usage of mains supply (measured through the RainSafe)

Why the contribution is important

The risks associated with emerging water crises both in the UK and externally can be alleviated.

A lesser requirement for heavy chemical dosing of drinking water will promote improved public health, eco-friendly resource management and cost savings.

Carbon emissions in the UK will be reduced as water is no longer pumped at higher pressure. This in turn will reduce network leakages.

Greater availability of water in the UK will attract water intensive industries to the UK, will safeguard agricultural production capacities and could even see the UK becoming a net exporter of water.

Storm attenuation benefits can accrue from the proliferation of Rainwater Harvesting installations.

The proliferation of Rainwater Harvesting installations can help improve and maintain aquifer levels

DEFRA and the UK can take a global lead in the move towards decentralised supplies (as approach that can promote “demand balancing” municipal supply management).

by gerrycash on September 20, 2014 at 04:36PM

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