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Table 3 the different schemes in case of exceeding microbiological limit values for risk and non-risk areas

From: Experimental based experiences with the introduction of a water safety plan for a multi-located university clinic and its efficacy according to WHO recommendations

Risk area Parameter Warning Threshold Alert Worst case
1 POU filter
2 CFU/1 ml 22°C, 36°C inspection, inspection, flushing, POU filter, meeting of taskforce water safety, meeting of taskforce water safety, stop of withdrawal,
   flushing, control within 1 day, Inspection, disinfection,
   control within 3 days If negative → finish use of POU filter Flushing,  
    If still positive → disinfection disinfection, POU filter, control within 1 day  
  P. aeruginosa,   inspection, POU filter,   meeting of task force water safety,
  Legionella spp.,   flushing, control within 1 d,   stop of withdrawal or POU filter, disinfection,
  E. coli Enterococci,   if negative → finish use of POU filter   control within 1 day,
  fungi   if still positive → disinfection   If negative → withdrawal allowed with POU for 5d,
      parallel water sampling
3 CFU/1 ml 22°C, 36°C   inspection, flushing, control within 3 days,   meeting of task force water safety, flushing,
    If still positive → disinfection,   disinfection,
    flushing,   control within 1 day
    control within 7 d   
  P. aeruginosa,   inspection,   meeting of task force water safety,
  Legionella spp.,   POU filter, flushing, control within 1 day, if negative → finish POU usage   stop of withdrawal or POU filter,
  E. coli,   if still positive → disinfection   if negative →
  Enterococci,     release of withdrawal and POU for 5d, parallel water sampling
  fungi