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Table 2 Total enumeration (CFU/100 mL) and identification of Gram-negative non-fermenting bacteria from the genera:Pseudomonas, Flavobacterium, Acinetobacter identified by the BBL Crystal kit (Becton Dickinson) and API 20 NE kit (bioMérieux), at every sampling point.

From: Identification of bacteria in drinking and purified water during the monitoring of a typical water purification system

Sampling points/Flow sheet CFU/100 mL Average ± SD Colonies identification
   Morphology & color Number of isolates BBL Crystal API 20 NE
Point 1 Feed Water (storage) 507 ± 50 Shining beige 02 F. multivorum P. vesiculares
   Circular Brown 02 P. aeruginosa P. alcaligenes
   Circular pumpkin 02 P. diminuta P. diminuta
Point 2 Two multimedia Filters 33 ± 12 Circular pumpkin 02 P. diminuta P. diminuta
   Circular pumpkin 02 P. diminuta P. diminuta
   Circular pumpkin 02 P. diminuta P. diminuta
Point 3 Two water softeners 173 ± 50 Circular pink 02 F. aureum P. vesiculares
   Circular pink 02 F. aureum P. vesiculares
   Circular pink 02 F. aureum P. vesiculares
Point 4 Activated carbon filter 897 ± 823 Circular brown 02 P. aeruginosa P. pcketti
   Circular white 02 F. aureum P. vesiculares
   Circular pink 02 P. vesiculares P. vesiculares
Point 5 One 5 micron filter 100 ± 20 Circular white 02 F. aureum P. vesiculares
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. aeruginosa
Point 6 Reverse Osmosis 8 ± 2 Circular beige 02 P. vesiculares P. vesiculares
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
Point 7 Continuous deionization 653 ± 344 Circular brown 02 P. aeruginosa P. fluorescens
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. aeruginosa
Point 8 Storage tank for the purified water. 40 ± 35 Circular brown 02 P. aeruginosa P. picketti
   Pointed yellow 02 A. lwoffi P. diminuta
   Pointed cream 02 P. fluorescens P. putida
Point 9 Light UV 27 ± 12 Circular brown 02 P. aeruginosa P. picketti
   Pointed cream 02 P. paucimobilis P. putida
   Circular brown 02 P. aeruginosa P. picketti
Point 10 0.05 micron Filter 87 ± 31 Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
Point 11: use 27 ± 12 Circular brown 02 P. aeruginosa P. fluorescens
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
Point 12: use 27 ± 12 Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
Point 13: use 27 ± 12 Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
   Circular brown 02 P. aeruginosa P. picketti
  1. SD = standard deviation (n = 3; p < 0.05)