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Aqua Gratis

A system designed to capture the bath and shower water, process it, and reuse it to flush up to four toilets in the home

July 2022
Gallery Aqua Gratis  1
Gallery Aqua Gratis  1


Aqua Gratis has been created to significantly reduce domestic water consumption. Capturing and reusing the bath and shower water to flush up to four toilets in the home gives at least a 30% saving on potable water needed to be supplied to the home. The use of greywater for flushing toilets saves around 200 litres a day for a family of 4. In times of drought, unlike rainwater harvesting, this solution has a regular supply of water. Aqua Gratis will reduce domestic sewage by 30%. This will reduce the energy used to process both water supplied and sewage treated by 30% and has a 13% greater Co2 savings than its mainstream competitor. This solution is low cost, low energy, easy to fit, use and maintain. Installing Aqua Gratis will benefit the water companies, developers, occupiers and the environment. Aqua Gratis is the missing element of zero-carbon homes. Today, water companies urgently depend on the cooperation of new home developers to work in partnership to achieve water neutrality.

  • /
Label Date July 5, 2022
From United Kingdom
Maturity stage Initial market commercialization
Looking For Network, New clients, Visibility, Funding, Partners, Credibility

The environmental benefits

  • Reuses bath and shower water to flush the toilet reducing domestic water consumption by 30% a saving of 200l per day for a family of 4
  • Reuses bath and shower water to flush the toilet reducing domestic sewage by 30% on energy to process it at the sewage treatment plant
  • Will reduce carbon emissions by 13% compared to nearest mainstream competitor
  • Installed in 10,000 homes, saves at least 288 tonnes of carbon per annum

The Financial benefits

  • In south of England, developers can get planning permission and a reduction on water and sewage connection charges up to €2139
  • More than 50% cheaper than alternative domestic rainwater harvesting system
  • For a family of four home, €238 per year savings on water and sewage bills

Activity Region

  • /


United Kingdom,

  • Headquarters
  • Activity

Company Profile

Cascade Water Products

This project has received funding from Horizon 2020 phase 1, Innovate UK and Scottish Edge

View company profile Solution website
Headquarters Baden-Powell Rd, Arbroath DD11 3LS, UK
Contact the Solution Provider Add to Favorites

The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator Cascade Water Products has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.