Topics Technology & Engineering

Diagram showing the Philadelphia Water Department's water treatment process

PWD Drinking Water Treatment diagram

PWD water tech at the Philly Home Show, 1960

PWD water tech at the Philly Home Show, 1960 (detail)

Belmont Filters construction 1903

Belmont Filters construction, 1903

Spring Garden Sewage Experiment Station, used to test water filtration methods

Outside Sprinkling Filters, Spring Garden Sewage Experiment Station, 1911

Black-and-white photograph showing the completed Upper Roxborough Filter system. Vaulted concrete ceiling with beds of filter sand.

Upper Roxborough Filter Beds Complete, 1903