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greywater is wastewater from residential sinks, showers, bathtubs and laundry. it is distinct from toilet and kitchen sink wastewater, known as blackwater. greywater is generally 50 to 80% of a household's waste stream. in america greywater is typically considered waste and routed to sewer systems and septic tanks along with blackwater. greywater can however be reclaimed for a second use, usually landscape irrigation. the benefits of this are many: reduced consumption of water, conservation of aquatic ecosystems, reduced load on septic tanks and municipal sewer systems, recharging your local water-table, saving money, and lowering overall energy usage. irrigating with greywater will lower your water bill; most installations pay for themselves within a few years. greywater basics PDF Sheet "greywater gardening" ebook |