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Metcalf & Eddy publish American Sewerage Practice – 99.3% of the population in cities of 100,000 or more use dilution as the only “treatment” of sewage.  The remaining 0.7% of the population uses irrigation.

Metcalf & Eddy publish American Sewerage Practice – 99.3% of the population in cities of 100,000 or more use dilution as the only “treatment” of sewage.  The remaining 0.7% of the population uses irrigation.