Workers in alum storage room at Filtration Building, Waterworks Park, Detroit water supply system
Grab
Description
View of workers in alum storage room at Filtration Building, Waterworks Park, Detroit water supply system. Label on back: "Alum storage room at filtration plant." Handwritten on back: "10 or 15 tons a day. Alum, aluminum sulfate. 1 [undecipherable] in 60,000 coagulatory [undecipherable]."