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| restoring beauty to our world... through intelligent water management |
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| Grey Water |
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Grey water is wastewater generated from domestic activities such as laundry, dishwashing, and bathing, which can be recycled on-site for uses such as landscape irrigation and constructed wetlands. This wastewater contains no faecal matter (human faeces). Grey water differs from water from the toilets which is designated sewage or blackwater to indicate it contains human waste.
Greywater makes up 50–80% of residential wastewater generated from all of the house's sanitation equipment (except toilets). |
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Most greywater is easier to treat and recycle than black water, because of lower levels of contaminants. While all grey water contains micro-organisms, the health hazards associated with grey water from a multiple-dwelling source should be considered differently from that of a single dwelling grey water source. |
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If collected using a separate plumbing system from black water, domestic grey water can be recycled directly within the home, garden or company and used either immediately or processed and stored. If stored, it must be used within a very short time or it will begin to putrefy due to the organic solids in the water. Recycled grey water of this kind is never safe to drink, but a number of stages of filtration and microbial digestion can be used to provide water for washing or flushing toilets. Some grey water may be applied directly from the sink to the garden or container field, receiving further treatment from soil life and plant roots. Given that grey water may contain nutrients, pathogens, and is often discharged warm, it is very important to store it before use in irrigation purposes, unless it is properly treated first. |
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