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Table 3

Comparison of bacteriological quality of immediately treated and treated water with 6 months storage at room temperature (pond, lake, and river water)

Bacteriological quality indicators	Treated water samples (immediate)			Treated water samples (6 months storage)
Bacteriological quality indicators	Pond	Lake	River	Pond	Lake	River
Mean value of bacterial populations (log CFU/ml)
Total aerobic bacterial count	1.3 ± 0.1	2.6 ± 0.2	0.8 ± 0.1	0.9 ± 0.1	1.1 ± 0.1	0.5 ± 0.1
Total coliform count	<1.0*	<1.0	<1.0	<1.0	<1.0	<1.0
E. coli	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0
E. coli O157:H7	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0
Salmonella spp.	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0
Vibrio spp.	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0

Bacteriological quality indicators	Treated water samples (immediate)			Treated water samples (6 months storage)
Bacteriological quality indicators	Pond	Lake	River	Pond	Lake	River
Mean value of bacterial populations (log CFU/ml)
Total aerobic bacterial count	1.3 ± 0.1	2.6 ± 0.2	0.8 ± 0.1	0.9 ± 0.1	1.1 ± 0.1	0.5 ± 0.1
Total coliform count	<1.0*	<1.0	<1.0	<1.0	<1.0	<1.0
E. coli	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0
E. coli O157:H7	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0
Salmonella spp.	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0
Vibrio spp.	<1.0	<1.0	<1.0	<1.0	<1.0	<1.0

* < 1.0 = below detection limit; detection limit: <1.0 log CFU/ml.