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Abstract In some areas, the increase in surface water salts and the wear and tear of urban water distribution network pipes have caused citizens to turn to household water purification devices. However, if their filters are not replaced on time, the quality of the output water will decrease. In this study, the efficacy of three household water purifiers was evaluated over a one-year period in Ahvaz city. TDS, pH and total coliforms were measured monthly at both the inlet and outlet of all three systems. Furthermore, the study involved weekly observations of the color change on the surface of the first filters, in addition to monthly measurements of the turbidity of both the inlet and outlet water from their first filters. Based on the findings of this study, the absence of coliforms in their output was confirmed. Furthermore, within the initial month following the installation of the first filter, the turbidity of its output water exceeded admissible limit. By the second month, a maximum change in filter color was observed. Also, following two years of membrane installation, it is essential to regularly monitor the effluent TDS. If the TDS of output water exceeds the admissible limit at any point, it is imperative to replace the membrane filter. Additionally, post-membrane installation, the effluent's TDS measures less than 50 mg/l, indicating a potential risk of water acidification. Therefore it is advisable to regulate the effluent pH by adjusting the mixing valve or replacing the sixth filter.
Mirsalari et al. (Fri,) studied this question.
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