New Filter Plant at Grand Rapids.

New Filter Plant at Grand Rapids.

Grand Rapids, Mich., is installing a new filtration plant, of which the press of that city speaks as follows:

Cost of filtration plant, approximately $400,000; capacity of filtered water, about 25,000,000 gallons every 21 hours; estimated daily demand upon filters, 12,000,000 gallons; reserve supply of filtered water will aggregate 8,000,000 gallons; 3,000,OO0 in effluent or pure water well and 5,000,000 in reservoir on the hill; installation of plant necessitated excavation of 35,000 yards of dirt and about 500 cubic yards of rock; to build foundations, basins, intake and discharge mains more than 34,000,000 pounds of concrete was used; in bulk this represents 9,000 cubic yards; there will be 10 individual filtration units each of nominal capacity of 2,000,000 gallons daily; two turboelectric generating sets will be necessary to fur nish power for pumps and other machinery at filtration plant; compressed air generating station and elevated cleaning or flushing tank exclusively devoted to cleaning of filters; sand for filters must undergo rigid microscopical and bacterial tests; obtainable only in four places in the world; independent set of low service pumps raised water to give gravity for flow through filters; mechanical stone crushing, mixing and agitating machinery for preparing chemicals, and ingenious central control system that feeds chemicals in just correct proportions to flow of water; plant will be in operation some time next spring.

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