"Back-flow". What is it? How can it be prevented?
Verhagen
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D003770:Dental Offices / Q000331:legislation & jurisprudence / Q000592:standards; D005161:Facility Regulation and Control / Q000331:legislation & jurisprudence; D006801:Humans; D019552:Infection Control, Dental / Q000379:methods; D008824:Michigan; D012498:Sanitary Engineering / Q000295:instrumentation* / Q000331:legislation & jurisprudence; D014871:Water Microbiology / Q000592:standards; D014881:Water Supply / Q000331:legislation & jurisprudence / Q000592:standards