![Diagram showing the Philadelphia Water Department's water treatment process](https://waterhistoryphl.org/wp-content/uploads/DrinkingWaterTTMNT_diagram_edit.jpg?w=300)
![Diagram showing the Philadelphia Water Department's water treatment process](https://waterhistoryphl.org/wp-content/uploads/DrinkingWaterTTMNT_diagram_edit.jpg?w=300)
![PWD water tech at the Philly Home Show, 1960](https://waterhistoryphl.org/wp-content/uploads/20041050194_crop2-scaled.jpg?w=300)
PWD water tech at the Philly Home Show, 1960 (detail)
![Lab tech at Philly Home Show, 1960](https://waterhistoryphl.org/wp-content/uploads/OriginalPhoto_20041050194-scaled.jpg?w=300)
Lab tech, water cleaning demo, Philly Home Show, 1960
![Gillette Schuylkill mud cartoon](https://waterhistoryphl.org/wp-content/uploads/D.6c_FINAL_2004.012.0027R_Typhoid_1906_edit-scaled.jpg?w=300)
‘Gillette, All By Himself, Gets Fine New Idea On Germ Slaying’
![Torresdale Conduit work gang, 1906](https://waterhistoryphl.org/wp-content/uploads/D.5_FINAL_1986.002.2546_crop-1-scaled.jpg?w=300)
Torresdale Conduit work gang, 12/18/1906
![Belmont Filters construction 1903](https://waterhistoryphl.org/wp-content/uploads/D.2_FINAL_1986.002.1075-scaled.jpg?w=300)
Belmont Filters construction, 1903
![Finished Upper Roxborough filters, 1903](https://waterhistoryphl.org/wp-content/uploads/D.1b_FINAL_1986.002.1032-1-scaled.jpg?w=300)
Finished Upper Roxborough filters, 1903
![Upper Roxborough filter beds](https://waterhistoryphl.org/wp-content/uploads/D.1a_FINAL_1986.002.0660-61-62-1.jpg?w=300)
Upper Roxborough filter beds under construction, July 1902
![Spring Garden water testing lab, 1901](https://waterhistoryphl.org/wp-content/uploads/B.1_FINAL_1986.002.0381_edit-scaled.jpg?w=300)
Bureau of Water Spring Garden Testing Station, 1901
![36. [Laboratory] Left to right: raw water, settled water, filtered water, ca. 1943](https://waterhistoryphl.org/wp-content/uploads/2012.002.0036.jpg?w=300)
36. [Laboratory] Left to right: raw water, settled water, filtered water, ca. 1943
![35. [Laboratory] Turbidity test ca. 1943](https://waterhistoryphl.org/wp-content/uploads/2012.002.0035.jpg?w=300)
35. [Laboratory] Turbidity test ca. 1943
![Laboratory Alkalinity test, ca. 1943](https://waterhistoryphl.org/wp-content/uploads/2012.002.0034.jpg?w=300)