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Recycling of Greywater
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Recycling of Greywater
Greywater recycling systems
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Most greywaters are much easier to treat and recycle than blackwaters, due to their lower levels of contamination. However, entirely untreated greywater is still considered to be a potential health and pollution hazard, because studies have established the presence of the same micro-organisms within greywater as found in sewage (albeit in much lower concentrations). Nevertheless, while all greywater will contain micro-organisms the health hazards associated with greywater from a multiple dwelling source should be considered different from that of a single dwelling greywater source. Within single dwellings inhabitants and their clothing are mutually exposed to each other''s greywater and their shared living arrangements will likewise expose them to the existing reservoir of micro-organisms within the dwelling, whereas greywater from multiple dwelling sources provides scope for exposure to a broader reservoir of micro-organisms thus increasing the risk of disease spread between dwelling unit inhabitants.

If collected using a separate plumbing system to blackwater, domestic greywater can be recycled directly within the home, garden or agricultural company and used either immediately or processed and stored. Recycled greywater of this kind is never clean enough to drink, but a number of stages of filtration and microbial digestion can be used to provide water for washing or flushing toilets; relatively clean greywater may be applied directly from the sink to the garden or container field, as it receives high level treatment from soil and plant roots. Given that greywater may contain nutrients (e.g. from food, fertiliser, ...), pathogens (e.g. from your skin), and is often discharged warm, it is very important not to store it before using it for irrigation purposes, unless it is treated first.