All our RotoTank underground storage tanks come in a beigie colour. These are used for storage of rain harvested water, fresh water and grey water.

Accessible via a manhole, underground storage tanks are submerged beneath the surface of the earth for non-portable purposes and for added safety when storing more hazardous materials such as diesel or septic waste.

Moulded from food grade polymer and with the option to include a 450mm stainless steel extension installation, this conversion allows for the maintenance of pumps and other underground tank adaptations including a French drain in underground septic tanks. Because these tanks are buried beneath the surface of the ground, underground storage tanks are reinforced with added thickness, heavy duty access points along with an eight-year UV protection (if only submerged after some time above ground) and a five-year structural warranty against the added heavy-duty technology that goes into the manufacturing of diesel tanks and plastic water containers.

There are three different types of underground Rototank Storage options

Each storage tank option caters to a unique set of storage characteristics, but are typically:

  • Used for the underground storage of harvested rain water or fresh water.
  • Installed underground for collection and reuse of domestic, grey water including bath water and waste water drain off from sinks, dishwashers and washing machines.
  • These plastic water containers are ideally installed for domestic, industrial and agricultural use.
  • Available in a standard or heavy duty option with 450mm or 180mm lids seals.
  • Characterised as a non-portable, durable and safe underground liquid storage facility.

Tips to installing underground plastic water containers or diesel tanks:

  • Tip 1: Always position the underground storage tank on solid, level ground, cleared from roots, rocks and other items that may puncture or damage the tank.
  • Tip 2: Always adhere to manufacturer and installation instructions and recommendations.
  • Tip 3: Be certain to only store the appropriate weight and approved material type in the respective tank, ensuring that that the underground tank is suited to the content type and volume of contents being stored.
  • Tip 4: Avoid top and lateral load stress by reinforcing the top and side soil with beams where necessary.

Install a septic tank or other underground storage tanks with five simple steps. Although straightforward, always ensure that each step is adhered to when installing your underground tank along with all factory fittings, instructions and recommendations.

  • Step 1

Excavate the appropriate size hole in which your Rototank underground storage tank will be sunk in. There will need to be enough clearance all the way around the tank.

  • Step 2

Lay out a solid, level and sturdy foundation to cover at least 300mm across the base of the excavation hole.

  • Step 3

Lower the underground tank into the excavated hole to stand level on the foundation.

  • Step 4

Join pipe connections using a water soap mix for easy fitting

  • Step 5

Use a sandy and slightly moist backfill, preferably with made up of a 1:6 concrete sand mix layers ending about 100mm from the top of the underground tank. See additional steps when installing a septic tank.