World Health Organization: Field Test Method for Thermotolerant (Faecal) Coliforms
The safe quality of water supplied to communities is an important consideration in the protection of human health and well-being, it is not the only factor that affects consumers.
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When water samples are collected for analysis, care should be taken to ensure that there is no external contamination of the samples. Unless valid samples are collected, the results of the subsequent analysis may be misleading. The World Health Organization: Field Test Method for Thermotolerant (Faecal) Coliforms mobile app provides a detailed list for the Field Test Method for Thermotolerant (Faecal) Coliforms.
The multiple-tube method, the membrane-filtration method gives a direct count of total coliforms and thermotolerant coliforms present in a given sample of water. The method is based on the filtration of a known volume of water through a membrane filter consisting of a cellulose compound with a uniform pore diameter of 0.45 or 0.2mm; the bacteria are retained on the surface of the membrane filter
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