Although you may survive without food for up to three weeks, you will perish without water for more than three days. With heat gradually drying up the usual water resources, such as dams, every drop of water becomes ever more important and worth saving. In response to this urgent need, and to address the increasing cost of water distribution, a growing number of Australian households now employ certain ways to utilise this gradually decreasing resource more efficiently, such as collecting rainwater. Utilising rain water tanks in WA homes, for instance, is becoming popular for this purpose. In fact, according to the Australian Bureau of Statistics, 32% of households have had water tanks installed as of 2010. Additionally, in capital cities, rainwater tanks are the second most popular source of drinking water.
http://www.rainfilltanks.com.au/info-articles/wa-water-tanks-making-single-drop-rainwater/
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