An increasingly popular option for architects and builders is an underground water tank. This allows for homeowners to maximise their space giving them more green space/or parking, when placed under paved traffic areas, driveways, garden beds or lawns, this solutions is not only aesthetically pleasing but an eco-friendly way to capture and harvest rainwater. With the smallest environmental footprint in the industry, Polymaster underground rainwater tanks give you the maximum capacity for the minimum square metreage.

  • Fully tested polyethylene tank designed to withstand ground and water pressure at depth.
  • Engineered by geotechnical experts including Finite Element Analysis (FEA). These calculations are provided with the tanks.
  • Sealed locking tamper proof lid.
  • Anti-flotation design and engineering specifications completed to AS1170.
  • Certified to AS/NZS 4766 Rainwater tank standard
  • The underground tank houses an 80LPM submersible pump delivering high volume and pressure suitable for most gardens

Vortex Filter
  • Self cleaning – captures more than 90% of water while cleaning your filter as well
  • Withstands up to 30 tonnes of vehicle weight
  • Extension risers available for deeper underground installation
  • Vortex Filter for roof area up to 200 square metres with 100mm pipe entry

Garden Pump


  • Fully automatic pressure system
  • Run dry protection
  • In-built electronic controls
  • Automatic reset
  • Quiet operation
  • 2 Years Warranty

Technical Specs

  • Voltage: 220-240v
  • Max power: 0.37kW
  • Inlet Rainwater: 1″ BSP (female)
  • Inlet Mains Water: 1″ BSP (female)
  • Discharge outlet: 1″ BSP (female)
  • Litres per minute: up to 82lpm

  • Capacity 5,000 L
  • Length 3520 mm
  • Width 1640 mm
  • Height 1665 mm

Delivery Map

Polymaster have a large fleet of trucks specialised in delivering rainwater tanks throughout Victoria, Southern NSW, and South Australia to your location or the store where you purchased it. If your tank is over 13,000ltrs it will be delivered for free. This map gives you a good idea of the zone.

polymaster delivery zone map australia nsw vic sa

Polymaster also deliver Australia-wide (and abroad) for all their Chemical, Diesel, AdBlue, Septic tanks, Equine, Calving and Animal Care products (extra freight charges apply).  For their Rainwater tanks, they deliver throughout Victoria, South Australia and Southern New South Wales. 


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