FAQs - Water Tanks

Q1. Can I get a rebate before I install the tank?

Each Australian state, territory and/or local council has a program which is unique to the area. You can go online and read about the rebate requirements and download an application form. You cannot claim a rebate unless you can provide evidence that you have already purchased and installed the tank. You must also provide evidence with your rebate application that a licensed plumber and/or electrician has completed the connection(s) and/or installation of a water proof power outlet to serve your pump(s).

Q2. What are the advantages of buying a rainwater tank?

There are many reasons why you should buy a rainwater tank and you don’t need to live in a wet or tropical area to reap the benefits. With a rainwater tank, you will:

• Collect most of the rain (around 80%) that falls onto the areas of your roof you have connected to gutters and downpipes into your tank. For example, if 10 mm of rain falls on to 100 m2 of roof you will harvest about 800 Litres of rainwater. • Reduce your consumption of mains water and, in the long term,

• Reduce your water bill. Your water supplier may be able to give you an indication of the savings you can expect.

• Lower your impact on the environment by reducing your demand on mains water as well as the amount of stormwater runoff into rivers and ocean.

Q3. What size tank do I need?

The appropriate tank size will vary depending on the size of your roof and yard, the number of people living in your house, and the rainfall in your area. Please note that in most council areas, tanks larger than 10,000 litres require a Development Application to be lodged. You need to check council requirements before you buy your tank.

Q4. Is there a rebate for a tank less than 2000 litres?

No. To ensure maximum water savings, only tanks with a volume larger than 2000 litres are eligible.

Q5. Why is there a higher rebate for tanks which are connected to toilets and/or washing machines?

Rainwater tanks which are plumbed into the house will save much more mains water. In addition, using rainwater for every day use means there are always capacity in the tank to collect water when it rains, and reduce the likelihood of overflow during periods of heavy rain. However, connecting a tank to a toilet or washing machine is more expensive, so the rebate is higher to encourage homeowners to take the next step and connect.

Q6. What is a backflow prevention device?

Tanks connected to toilets or washing machines must have a backflow prevention device to stop water from the tank mixing with the drinking water supply. This ensures the quality of drinking water is not affected by your tank water. The licensed plumber who installs your tank will need to ensure appropriate backflow prevention is in place.

Q7.What is a first-flush device?

A first-flush device ensures that the initial rainwater collected from your roof does not enter your tank, but washes into your existing stormwater system. This helps to reduce the amount of contaminants and sediment from the roof entering your tank. First-flush devices are available at iEarth.

Q8. Can I use my tank to water my garden if it's plumbed into the house?

If your tank is topped-up by mains water, you may still be subject to any water restrictions in place in your area. Contact your local water utility to check what water restrictions apply and restriction requirements for tanks with mains top-up.

Q9. What is involved in maintaining my tank?

There are several things which need to be done to maintain a rainwater tank.

• Install first-flush devices, screens and guards - To stop debris and insects entering the tank. First-flush devices are essential for reducing the amount of sediment and other materials entering the tank and polluting the water.

• Inspect gutters and roof catchment areas regularly and keep them clean and clear of leaves and debris - Regularly clean screens and guards. Keeping your rainwater flowing cleanly and quickly into your tank reduces the build up of sludge as well as the risk of mosquitos breeding in your tank.

• Check for sludge in your tank at least every 2-3 years. If sludge is covering the bottom of your tank, you'll need to remove it by siphoning it out or completely emptying your tank (contact a professional tank cleaner for advice). A lot of sludge means you may need to pay more attention to your roof and gutter areas. Remember to make sure you prevent mosquito access to your tank. If you find mosquitoes in your tank, find the entry point and seal it.

Q10. What type of tank base do I need to install?

The most important would be to ensure a levelled base. Type of base varies such as in-situ reinforced concrete slabs, prefabricated concrete slabs, compacted crush rock. The base you choose must be solid, compacted well and not subject to movement, especially due to water.