GRAF UK supplies a comprehensive range of underground rainwater harvesting systems for domestic and self-build projects. Our Platin flat tank range offers a shallow-dig solution with tanks from 1,500 to 65,000 litres, ideal for sites with restricted excavation depth. Our Carat underground tank range runs from 2,700 to 122,000 litres and is suited to larger projects and groundwater-stable installations.

Both ranges are available as garden irrigation systems, supplying outdoor water use from a simple pump and filter setup, and as full household systems supplying toilets, washing machines, and garden use via an automatic control unit. Systems are available in direct and indirect configurations to suit different project requirements and compliance needs.

All GRAF tanks are manufactured from 100% recycled plastic and carry a 15-year warranty. Free UK mainland delivery is included as standard