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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

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