The removal of viruses from drinking‐water supplies is not a long‐established practice, but it is an issue of major concern. Diatorhaceous‐earth filtration has been demonstrated to remove viruses from water effectively; however, as this article emphasizes, more research of and experimentation with this process is necessary. Part 1, involving the study of the bacteriophage T2 for E. coli, appeared in JOURNAL AWWA, 66:2:98 (Feb. 1974).
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