Project brief Commercial greywater reuse
Cambridgeshire
water reuse pilots.
How much mains water could a business save by using shower water to flush its toilets? The Water Efficiency Cambridgeshire Fund selected Cascade to test Aqua Gratis in five commercial pilots.
The project
Why test reuse in
commercial buildings?
In a building with showers and toilets, water from one use can supply the other. Aqua Gratis filters and stores used bath or shower water, then supplies it to toilet cisterns that would otherwise draw on the mains.
Cambridge Architectural Research described working with Cascade on installation and testing. It identified sports, education and commercial premises with baths or showers as possible hosts. Cascade’s July plan also included training local plumbers alongside the installations.
Follow the Aqua Gratis water routeProject evidence
What do we know so far?
Projected mains water saving
Up to
80,000 litres
Across all five pilots combined during the 2026/27 financial year. Cascade published this target in its July announcement.
Measured savings
Awaiting published results.
The public updates confirm funding and describe the work planned. As of 5 November 2026, they give no metered savings total or confirmed number of systems in operation.
To assess the eventual figure, readers will need the number of sites reporting, the period covered and the volume of mains water displaced.
See the source documentsProject record
Sources and dates.
The fund supports non-household water savings in the Cambridge Water Resource Zone. MOSL administers it on behalf of the Ministry of Housing, Communities and Local Government.
Project enquiries
Talk to Cascade
about the pilots.
For a progress update, a discussion about your premises or a question about plumber training, contact Carolyn Hogg, Managing Director.
carolyn@cascadewater.lifeChoose an email enquiry
Request a project update Discuss a commercial building Ask about plumber training