A cross connection could occur with your garden hose, for instance, if it is left in places, such as a wading pool, a fish tank, or a floor drain, where contaminates could funnel into your drinking water. Homeowners are advised to consult with a certified Calgary plumber who can quickly identify the cause of discoloured water from your pipes, as well as they do with your clogged or smelly drain pipes and be able to assess and perform the repairs needed. Potable water can be seriously contaminated due to backflow, which is water flowing in reverse because of back pressure or back siphonage. Back pressure is caused when the system’s pressure (ex: thermal expansion) is higher than the pressure in the supply, while siphonage occurs when the main supply is being interrupted or temporarily depleted or drained, causing a vacuum that sucks liquid back up the pipes.
http://www.son-riseplumbing.ca/Calgary-Plumbing/info-articles/backflow-preventer-solutions-calgary-plumber/
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