Subjects Filtration

Diagram showing the Philadelphia Water Department's water treatment process

PWD Drinking Water Treatment diagram

Belmont Filters construction 1903

Belmont Filters construction, 1903

Finished Upper Roxborough filters, 1903

Finished Upper Roxborough filters, 1903

Upper Roxborough filter beds

Upper Roxborough filter beds under construction, July 1902

Two bottles of water from a river, one dark with pollution and one clear after filtration

Water Before and After Roxborough

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