Rainwater harvesting

DEFINITION: The collection and storage of roof rainwater for on-site reuse. The water makes its way through rainwater systems and fine mesh filters, into a tank, usually underground, and then is pumped from that tank to be used in a number of non-potable applications. This can reduce the demand on the potable water supply provided by the water companies significantly and reduce water costs.

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As companies link up with charities to raise awareness of World Water Day, a new report from the United Nations (UN) has suggested that the "vast potential" of using wastewater as a resource remains "underexploited".