How do I install my Nylex tank?

Once you have decided on the right tank for your needs, you can take a lot of the stress away from setting it up with a bit of planning and the answers to some simple questions. For example:


  1. What type of base your tank will sit on – e.g.; concrete, sand or on a stand?
  2. How are you going to connect it to the roof – e.g.; how many down pipes will supply the tank, types of filters, first flush devices etc.?
  3. How are you going to deal with the overflow – e.g.; connection to the storm water drain?
  4. What sort of attachments (pumps, hoses etc.) will you be connecting to your tank for use?

Your Nylex dealer or local plumber are good sources of information and can also help out with the project.

In fact Nylex recommend your tank is installed by a suitably qualified plumber. This ensures the work complies with the relevant building regulations and that you are eligible for any Government water rebates applicable to your location.

In Addition:

  • The site must be level and free of rocks, stones and sharp objects
  • The tank should not be buried more than one third of its wall height
  • Ensure that the tank base is at least 600mm larger in diameter than the tank
    • Sand Base: A 75-100mm bed of level packing sand can be used as a base for your tank. The sand will need to be well compacted and contained to avoid any under tank erosion from wind, water, burrowing animals etc..
    • Tank Stand: The tank can only be mounted on a stand that has been certified as capable of supporting the weight of the tank when full – all Nylex tank stands are certified. The site must include an appropriate foundation and you may require building approval for tank stands over 1,000L. Rainwater tanks can be positioned on a number of different bases: Concrete Base (preferred): A minimum 100mm, level and smooth finished concrete slab will provide an excellent base
  • A length of flexible pipe (at least 300mm long) should be installed after the ball or gate valve to absorb any shocks or movement generated by the delivery system
  • Make sure all pipes are well supported and do not depend on the tank for support
  • To avoid undermining the base, the tank overflow should be run well away from the tank
  • Inlet and overflow pipes should be of the same diameter to prevent water overflowing through the strainer.