Upper Roxborough filter beds under construction, July 1902
Rudolph Hering
Outhouse over the Schuylkill near Pottstown
McConnell Germ-Proof Filters ad
Standard Philadelphia (B) Hydrant
Plan for the Collection, Purification and Disposal of the Sewage of the City of Philadelphia, 1912
Typical house drainage
Pegg’s Run, Northern Liberties (Watson’s Annals)
Wastewater Treatment Process diagram
Jar of raw sewage before treatment, 2000
