| Page. | | Introduction | 3 | | Sewage, sewers, and sewerage defined | 1 | | Nature and quantity of sewage | 2 | | Sewage-borne diseases and their avoidance | 2 | | How sewage decomposes | 5 | | Importance of air in treatment of sewage | 7 | | Practical utilities | 8 | | Septic tanks | 21 | | Grease traps | 43 | | General procedure | 45 |
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