The Danger of Water Filters.
In a series of experiments with water filters reported to the Rhofie Island Medical Society, Dr G. T. Swarts has presented certain facts which are opposed to the general belief regarding the value and efficiency of filters a? commonly used in the household for the purification of_ drinking vater, and which, from their important bearing on health, are belieyed to be worthy of more general recognition. The results obtained prove that some filters when first psed successfully remove a certain proportion of organisms from the water. Other tests made seventeen days later showed in every case a marked increase in the number of colonies-in the filtered as compared with unfiltered water. For instance, the unfiltered water contained thirty-six colonies of growth, while the filtered water showed the presence of colonies to the number of 2,000, fi,ooo, and 10,000. An examination on the seventieth day showed an increase in the case of one filter of 117,000 colonies. Another series of experiments was made to determine how far the consumer could cleanse his filter or sterilise it in some simple manner. The results showed, however, that even with every possible precaution, the number of organisms in filtered water exceeded the number in unfiltered by several thousands, investigations allow conclusively that the organic matter retained in the meshes or interstices of the filtering media contains organism's which increase rapidly while the filter is or in use, and'especially if its position is in-a warm kitchen or in close proximity to a hotwater pipe. The lesson to be drawn from these experiments is obvious. Filters, by becoming clogged and from the impossibility of perfectly cleansing them, foster the very dangers to health they are designed to prevent, and therefore only those filters which can be thoroughly and easily cleansed should be used.
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The Danger of Water Filters., Evening Star, Issue 8025, 30 September 1889
The Danger of Water Filters. Evening Star, Issue 8025, 30 September 1889
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