Grey water

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Domestic waste water can be split into two. Sewage from the toilets, kitchen sink and dishwasher is different from the waste water from wash hand basins, baths, clothes washers and showers. If the latter is collected in an underground tank of, say, two - three cubic metres per person, then some of it can be pumped up to fill the toilet cisterns or for irrigating the garden. This water is called grey water because it is cloudy from the soap or detergents. It is perfectly adequate in quality and health and safety for these jobs. By installing a grey water system into new or refurbished houses, the clean water consumption can be halved, saving on a precious resource and on energy required for pumping. This should be mandatory everywhere!

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