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That branch microscopic examination devoted the detection the specific cause bad odors and tastes in impounded waters too well known and too ierally employed and the necessity for its practice too firmly established necessitate any consideration but the study the plankton causing rapid clogging filters in rapid european systems receiving altogether too little attention analysts in chaige filter installations. It not uncommon have the period ssrvice between filter washings cut down fuUy per cent in the course two or three days, due the sudden multiplication organisms one species or another, thus forcing the purification plant its capacity and not infrequently rendering its operation almost impossible.
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