In order to reduce consumption of non-potable water, gray water can be collected from sinks, tubs, and everything else except toilets, and then reused for other purposes in order to reduce fresh water consumption. Above is one possible set-up used for gray water collection.
As a general rule, gray water does not require extensive chemical or biological treatment before it can be used in its most useful places, the lawn and garden. Note that gray water may contain food particles, detergent or soap residue, and possibly some human pathogens.
Caution: In some areas, reuse of water is prohibited by health officers and/or plumbing inspectors. Make sure that it is legal in your area before setting up a gray water collection site in your home!
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