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What are common examples of cross connection hazards (source of contamination) that need to be protected with a backflow preventer?

April 26, 2017backflow common connection contamination cross examples hazards Preventer protected source

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What are common examples of cross connection hazards (source of contamination) that need to be protected with a backflow preventer?

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Residential: • Fire sprinkler system • lawn irrigation systems • Auxiliary water supply (wells) • hot tubs/spas • swimming pools • hose bibs/garden hose • boiler Commercial: • boiler • carbonation equipment • film processors • fire systems • x-ray machines • dental equipment • etching tanks • Note: Toilets and sinks have an Air Gap for backflow protection