How Does a Rainwater Tank Work?
Thursday, October 7, 2010 7:36Rainwater tanks store rainwater run-off from catchment areas like your roof. In most cases, the water from your roof is funnelled along your gutters and into downpipes connected to your tank. If you are going to install a rainwater tank, you may need to alter your guttering. To get the best out of your rainwater tank, it’s important to install appropriate screens to stop debris and insects entering the tank.
What can I use my tank for?
In urban areas, NSW Health supports the use of rainwater tanks for non-drinking uses, including:
| • toilet flushing | • washing clothes |
| • water heating systems | • garden watering |
| • car washing | • filling swimming pools |
| • spas and ornamental ponds | • fire fighting |
NSW Health recommends that people use the public water supply for drinking and cooking because it is filtered, disinfected and generally fluoridated.
Irrigation Systems
Rainwater from your tank is suitable for use with garden irrigation systems. However, if you plan to connect your rainwater tank to an irrigation system, you should ensure that you have a filter on your tank. Algae or debris can sometimes be present in rainwater tanks, and a filter will stop blockages occurring in your irrigation sprays.
Toilets and Washing Machines
Connecting your tank to your toilet cistern or your washing machine is a good way to maximise the use of rainwater because you will use tank water even when it is raining. To supply your toilet and washing machine with rainwater you will need to maintain a minimum operating water level in the tank when there is insufficient rainfall. A licensed plumber should install a top-up system from the drinking water supply or a ‘rainwater tank control valve’ that automatically switches to mains water when the tank is empty. You will need to consult a licensed plumber about this.
Hot Water
Where rainwater is used in hot water systems it is particularly important that you’re aware of the advice from NSW Health and the manufacturers of items forming part of or connected to the heated water system. Water quality can have a significant effect on the performance and life of water heaters and other items connected to the heated water system.
Hot water storage tanks have a device called a sacrificial anode that protects the hot water tank from corrosion. Although it is not common, it is possible that the mixture of rainwater and mains water will cause the sacrificial anode to wear out faster than normal. It is advisable to have the sacrificial anode in your hot water system checked or replaced every four to five three to four years.
This article is courtesyof Curl Curl Plumbing, http://www.curlcurlplumbing.com.au



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