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((refimprove|date=July 2016))

'''Dual piping''' is a system of plumbing installations used to supply both [[potable water|potable]] and [[reclaimed water]] to a home or business.  Under this system, two completely separate water piping systems are used to deliver water to the user.  This system prevents mixing of the two water supplies, which is undesirable, since reclaimed water is usually not intended for human consumption.

In the [[United States]], reclaimed water is distributed in lavender (light purple) pipes, to alert users that the pipes contain non-potable water. Hong Kong has used a dual piping system for [[Water_supply_and_sanitation_in_Hong_Kong#Seawater_flushing|toilet flushing with sea water]] since the 1950s.

According to the El Dorado Irrigation District in California, the average dual-piped home used approximately ((convert|0.17|acre.ft|m3|lk=in)) of potable water in 2006.  The average single family residence with traditional piping using potable water for irrigation as well as for domestic uses used between ((convert|0.63|acre.ft|m3|lk=in)), higher elevation, and ((convert|0.78|acre.ft|m3|lk=in)), lower elevation.

== Further reading ==
*Tang, S.L., Derek P.T. Yue, Damien C.C. Ku: Engineering and Costs of Dual Water Supply Systems, International Water Supply Association 2007, ((ISBN|1-84339-132-5))

[[Category:Plumbing]]


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