Dual system

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Terms & Synonyms

Official WHO Definition

A situation in which a second plumbing system is installed alongside the system for provision of drinking-water. An example is a potable drinking-water system and a greywater system in the same facility (WHO 2006).Two separate water piping systems distributing water to customers, one carrying potable water and the other conveying lesser-quality water (e.g., non-potable reclaimed water) for reuse purposes (Symons et al. 2000). A dual hot water system is a system where there is more than one source of energy used to heat water either directly or indirectly (Doyle KM 1990). 

Other Definitions


Interpretations and Explanations


Symons, J. M., Bradley, L. C. Jr. and Cleveland, T. C. 2000. The Drinking Water Dictionary. American Water Works Association WHO (2006) Health Aspects of Plumbing Doyle KM (1990) Plumbing and gas fitting. Vol. 2:  Services and roofing.  

WHO Lexicon page (translations and examples)

See also

External Resources


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