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Questions regarding sustainable use of water, or water's impact on sustainability in general. For questions on [waste-water], [greywater], [seawater], [water-footprint] or [virtual-water] please use that tag.

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What's an effective design for sending sink water to a toilet tank?

This will leave you with only black water drains entering the septic/sewage system, thereby providing use of the same water twice before discarding, and as such greatly reducing your water usage. … Urine reaching the grey water, e.g. urinating in the shower. Cleaning products in the grey water, and their affect on plant life, if using to water the lawn/garden. …
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