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Current IssueSeptember 30, 2014
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WC&P is proud to offer this comprehensive glossary to our readers and website visitors. This living document is intended to serve as an easy-to-use reference source for information on the POU/POE water treatment industry. 

 

Any suggestions or input that would further enhance or expand the glossary are strongly encouraged.

 

We would like to formally thank and credit such organizations as WQA, AWWA, WEF, Lenntech and other web glossary sources for providing some of the basis and background of this compendium.

Air gap

A clear vertical space through the free atmosphere between the lowest opening of any pipe or faucet conveying water or waste to a tank, plumbing fixture receptor, or other device and the flood level rim of the receptacle. An air gap prevents cross connection between a water treatment device and a possible source of wastewater, so as to prevent a reverse flow of water from the sewer into the water supply system. Otherwise, a reverse flow could occur when negative pressure is created in the water supply line, or from an increase in the pressure in the sewer system. Local plumbing codes usually require the air gap to be twice the diameter of the inlet, with a minimum width of 1.5 inches.