Violet Red Bile Agar (Oxoid CM107) was used for the purposes of isolating coliform bacteria. Red violet colored colonies of 2-3 mm diameter were counted after 24 hours of incubation at 37 °C, which was realized after inoculation with double layer pour plate inoculation method [7]. TBX agar (Oxoid CM945) was used for the purposes of Escherichia coli isolation.