The new generation of Carat rainwater tanks has been specially developed for rainwater harvesting. Easy to transport due to stackable design and low weight.

Logistical advantages of the Carat tank

The Carat tank consists of two half shells which can be stacked on top of each other, allowing multiple tanks to be stacked on a single pallet for shipping. For example, it is possible to stack five 6,500 ltr Carat tanks, or nine 2,700 ltr Carat tanks on a single pallet. This allows a standard 40 ft. Shipping container to house a total tank volume of up to 130,000 ltrs! The tanks unique stacking feature reduces transport costs and environmental impact from vehicle emissions, whilst allowing shipments to any destination in the world.

Easy and safe assembly

  • The patented quick connection (illustrated in green), allows the Carat tank to be assembled in only a few minutes. Disassembly is possible at any time.
  • The first-class EPDM material used in the profile sealings (illustrated in yellow), has been laboratory tested. It lasts more than 25 years.
  • The centering bolt (illustrated in orange) assures the accurate and easy assembly of the two half shells preventing any leaks.

More advantages

  • Highest stability and unique fitting accuracy thanks to new production processes.
  • Consistent quality due to constant production monitoring.
  • Suitable for up to 12 tonne vehicle loading (when combined with the Telescopic cast iron cover).
  • Groundwater-stable up to the middle of the tank thanks to the extremely stable construction (more water stability options for higher water table on request).
  • Investment security thanks to 15-year warranty - compare it!
  • Can be expanded as often as required.


  • Global innovation - the new generation of the Carat rainwater underground tanks has been specially developed for rainwater harvesting.
  • The Carat tank can be individually tailored to your needs as a garden or house tank using the interconnection system.


Volume [l]Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry

calculated size Request for information

Technical details


Earth covering with loading capacity [mm] 800-2000
max. axle load [t] 8
max. vehicle weight [t] 12
max. vehicle weight with reinforced concrete slab [t] 60

Groundwater installation

Earth covering with groundwater installation [mm] 800 - 1800


max. earth covering [mm] (without groundwater, vehicle loading) 2000