Table 2.

Water and biofilm characteristics in the first loop of the distribution system fed for 2 months with GAC water (network A) or nanofiltered water (network B)

First loop of network:Avg (SD [n = 3])a
No. liter−1 or cm−2C (mg liter−1)Total chlorine (mg of Cl2 liter−1)Temp (°C)
Total bacterial cellsCulturable bacteria (CFU)Coliforms (CFU)Total protist cells
3 days15 daysDOCBDOC
A
 Water3.6 × 108 (4.7 × 107)3.2 × 104 (2.3 × 104)2.2 × 106 (1.3 × 106)01.8 × 105 (8.2 × 104)1.7 (0.6)0.55 (0.6)024.9 (1.8)
 Biofilm4.3 × 107 (3.5 × 105)5.9 × 103 (6.4 × 103)3.3 × 105 (3.0 × 104)01.4 × 103 (86)
B
 Water5.3 × 107 (4.8 × 106)1.3 × 104 (9.1 × 103)1.7 × 105 (5.9 × 104)000.3 (0)0024.5 (1.6)
 Biofilm7.1 × 106 (3.6 × 105)2.4 × 104 (3.5 × 102)1.6 × 105 (1.3 × 104)00
  • a 0, not detectable; —, not measured.