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Graywater Guide
This 1995 guide describes the proper uses for gray water ("untreated household waster water which has not come into contact with toilet waste") under California Graywater Standards. Topics include why one would use gray water, and the steps for installing a gray water irrigation system such as planning, obtaining a permit, system inspection, and maintenance.  Opens directly into a PDF document. From the California Department of Water Resources.
http://www.owue.water.ca.gov/docs/graywater_guide_book.pdf

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