Graf Rondus rainwater storage tank 3000 litres for shallow ground applications is ready to ship and IN STOCK. This is the revolutionary Rondus underground rainwater storage tank introduced to allow underground tank storage in areas where only a shallow excavation is possible.

Use the Rondus for rainwater harvesting in the house and garden

Ideal for difficult installation situations, e.g. rocky subsurface

Suitable for installation in groundwater, max. groundwater level corresponds to the top ground surface. Follow installation instructions

Frost-proof installation at a depth of 1,600 mm (lower edge of container)

Ground-water-stable. The Rondus underground tank is, due to its specifically engineered design, so stable that can be completely installed in ground water and stratum water, as well as cohesive ground surfaces (i.e.,  loam – in connection with buoyancy control). The maximum ground-water level corresponds to the upper edge of the land. 

Flat designThe flat design of the Rondus enables a sensationally shallow mounting depth - which means a less excavation than for a classic rainwater-based system – in fact, excavation is reduced by approx. 40%. Even so, all components which carry water are at least 60 cm below ground – in the frost-free level.

Total Height 1380mm, Length 2890mm, Width 2480mm

Can be installed in ground water and stratum water, as well as cohesive ground surfaces (i.e.,  loam).

In general, can be installed in a frost-free area through a tank manhole pit (500 mm).

Continuously adjustable installation depth through a telescope manhole cover.

Trouble-free assembly due to shallow excavation.

Long life, 15-year warranty

TÜV safety-tested

Low tank weight means can be installed without a crane

Large access (> 600 mm) for easy inspection of the tank

Tanks made from 100 % recyclable polyethylene

Best water hygiene due to smooth inner tank surfaces and use of food-safe materials

The Rondus tank comes with a Pedestrian PE Lid (green) and seal kit. To order a Vehicle loading lid GF-381504 or an extension to the turret Gf-319501 please call 01733 405100. 

For the manufacturer's leaflet in pdf format click here

For technical details, dimensions,engineering drawings and installation instructions click here