Plumbing

Product Quality Guarantee

GRAF Platin
Underground Rainwater Tank

Shallow Excavation

Finally a system that offers all the advantages of a traditional water tank without taking up vital space in your backyard. The innovative Platin tank range by Graf is specifically designed for storage underground, providing all the extra water you need, conveniently and economically.


  • Minimum installation depth, which translates into short installation time and lower costs
  • Suitable for vehicle loading
  • Small footprint = less digging
  • Groundwater stable - Designed to prevent flotation
  • Internal seamless joins
  • Award winning German design, made in Australia
  • Suitable for stormwater retention/detention

What are the benefits of underground tanks?

Saves valuable space.
Assists in keeping water cooler.
Tanks are hidden from view.
Potential algae growth is eliminated.
Protection from vandalism or accidental damage.
Rainwater can be collected from all downpipes rather than one or two as with above ground tanks.

Where can I find information about installation and maintenance requirements?

Please refer to the Installation Instructions.

How much do the tanks weigh? Is a crane required to lower the tank into the ground?

Graf Platin tanks vary in weight from 80kg (1500 litre tank) to 240kg (5000 litre tank). Tanks can be lowered into place using digging machinery and a crane will not be required.

How much rainwater will I collect?

As a rule of thumb: 1mm of rainfall on 1 square metre of roof space = 1 litre of water

What fill material should be used?

Crushed Rock 7mm minus is the recommended fill for the surrounding trench. Other suitable fill materials can be found on page 2 of the Installation Instructions.

Can the tank be installed where groundwater is an issue?

Platin Underground Tanks have been specifically designed to ensure that the tank will not float in areas where groundwater is present. Tanks can be installed securely even in areas where groundwater reaches the shoulder of the tank without the need for ballast or concrete. If groundwater is higher please contact your local Reece branch for further information.

Is ballast or concrete required to hold the tank down?

The Platin Underground Tank was designed to maintain its installed position without the need for additional concrete weight or anchors. Installation integrity is also preserved when the water level is low, with no requirement to maintain a minimum water level to act as ballast. These features ensure that installation costs are reduced and the full capacity of the tank is always available to the user.

How much weight can the lid take?

The standard lid will accept pedestrian traffic up to 150kg. The vehicular lid will accept passenger vehicles up to a gross vehicle mass of 3.5 ton.

Do I need to fill the tank with water prior to backfilling?

The tank should be filled 1/3 with water before backfilling the surrounding trench.

What is the warranty on the tank?

All Graf tanks come with a 15 Year Manufacturers Warranty, backed by Reece Customer Care.





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