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The performance of two ceramic filter candles and one silver‐impregnated ceramic filter candle with a layer of activated carbon, randomly selected from those available in the Indian commercial market, were evaluated employing the Escherichia coli and poliovirus challenge tests and a long‐duration filtration test mimicking the home treatment of water. None of the candles appeared reliable as microbiological water purifiers. The study indicated that specifications/standards should require filter candles to retain suspended particles down to a size of 1 μm to ensure at least a bacteriologically safe filtrate. Additional disinfection or boiling must be practiced during suspected outbreaks of waterborne viral diseases.
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Chaudhuri et al. (1994) studied this question.
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