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Table 3

Data obtained from the microbiological analyses on the A samples collected during the second part of the investigation

1st week2nd week3rd week4th weeka12th week13th week
WS HPC (CFU/mL) at 22–37 °C 
684–556 676–508 1,344–1,004 147–52 61–46 131–155 
13–15 14–13 48–21 12–44 26–7 12–11 
21–9 26–7 41–35 50–19 49–6 10–15 
43–32 122–41 106–44 99–34 372–97 108–36 
WS Specific tests 
      
▪ ▪ ▪ ▪   
▪ ▴ ▪ ▴ ▪ ▴ ▴ ▪ ▴ ▪ ▴ 
 ▪ ▪ ▪ ▪ ▴ ▪ 
1st week2nd week3rd week4th weeka12th week13th week
WS HPC (CFU/mL) at 22–37 °C 
684–556 676–508 1,344–1,004 147–52 61–46 131–155 
13–15 14–13 48–21 12–44 26–7 12–11 
21–9 26–7 41–35 50–19 49–6 10–15 
43–32 122–41 106–44 99–34 372–97 108–36 
WS Specific tests 
      
▪ ▪ ▪ ▪   
▪ ▴ ▪ ▴ ▪ ▴ ▴ ▪ ▴ ▪ ▴ 
 ▪ ▪ ▪ ▪ ▴ ▪ 

Bolded values were above the respective admitted limits (see Table 1).

aDuring weeks 5–11, no water samples were collected and the softeners were switched off. Presence of P. aeruginosa (▴), presence of coliforms (▪).

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