o the river, that it comes through into the city mains, as it does by natural down charged with earthy matter and looks so forbid- process into the deep well or the mountain spring. Of the way in which this is done, the filtration plant ding. But in quiet times, when animal and vegetable matter… … Partly Completed Filter. A MODERN FILTRATION PLANT. face by the wind, the clear water may be and often is The water is drawn from the Potomac River above city tunnel, commonly known as the Lydecker tunnel, much more fully charged with dangerous microscopic Great Falls, at a point 14 miles from…
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