Abstract
Availability of safe drinking water is a prerequisite for survival and safeguard against various water-borne diseases. The study was carried out with an aim to check the efficacy of water purifier systems by assessing the bacteriological and physico-chemical parameters (temperature, turbidity, pH, TDS, chloride, total hardness, dissolved oxygen, and free CO2) in industrial RO water samples from various outlets at Maitreyi College and household RO and filtered water samples from two residential areas (Satya Niketan and Geeta Colony) located in Delhi, India. The results obtained were compared with the standard values set by the World Health Organisation (WHO) for safe drinking water. Out of total 29 samples analyzed for various physico-chemical parameters, the values of most of the samples were found to be within permissible range. The values of some parameters for drinking water samples collected from filter and RO purifier installed at Geeta colony were above the maximum limit which can pose serious threats to health. The bacteriological examination was assessed by the Most Probable Number (MPN) test and the results of EMB agar plates showed that there is probability of presence of coliform bacteria in 3 samples. The results obtained signify that it is important to check the purity of drinking water at regular intervals irrespective of the fact that it is filtered. Also, it is imperative to ensure regular maintenance of purifier systems installed as they themselves might be the source of impurity.
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