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Table 2

Results of the CFU counts for the A and B samples collected during the last week of the first experimental period

Water softenersHPC (CFU/mL)
P. aeruginosa (CFU/100 mL)Coliforms (CFU/100 mL)
22 °C37 °C
SampleA/BA/BA/BA/B
1 E.C.a 1,536/135 1,032/106 0/0 0/0 
2 (Kit 15%) 102/11 103/4/0/0 
3 (Kit 7%) 25/2 32/3 6/0/0 
4 (Kit 4%) 22/1 17/3 0/0 50/2 
5 (Man 15%) 93/7 91/6 0/0 0/0 
6 (Man 7%) 85/4 77/1 0/0 6/
7 (Man 4%) 119/10 182/0/0 0/0 
8 Control 764/82 844/74 0/0 0/0 
Water softenersHPC (CFU/mL)
P. aeruginosa (CFU/100 mL)Coliforms (CFU/100 mL)
22 °C37 °C
SampleA/BA/BA/BA/B
1 E.C.a 1,536/135 1,032/106 0/0 0/0 
2 (Kit 15%) 102/11 103/4/0/0 
3 (Kit 7%) 25/2 32/3 6/0/0 
4 (Kit 4%) 22/1 17/3 0/0 50/2 
5 (Man 15%) 93/7 91/6 0/0 0/0 
6 (Man 7%) 85/4 77/1 0/0 6/
7 (Man 4%) 119/10 182/0/0 0/0 
8 Control 764/82 844/74 0/0 0/0 

The sanitizing solutions (4, 7, and 15% of NaClO) were introduced automatically at each regenerating phase (kit × %) or manually once a month (man × %). The A and B samples collected from the main supply were always negative for colony growth.

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

aE.C. = electrolytic cell.

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