TABLE 1
MICROBIOLOGICAL ANALYSIS OF WATER SAMPLES
Variable Technique Medium Incubation Incubation
temperature time
Heterotrophic bacteria Spread plate Nutrient agar (Biolab) 37°C 48h
Total coliforms Spread plate Chromocult coliform agar (Merck) 37°C 24h
Faecal coliforms Spread plate Chromocult coliform agar (Merck) 44.5°C 24h
Salmonella Spread plate Rambach agar (Merck) 37°C 24h
Coliphages Double-agar-layer
plaque assay (Grabow et al.,
1984) using E. coli strains
WG4 and K12 as hosts. Phage agar (Grabow et al., 1984) 37°C 18h