Workers in alum storage room at Filtration Building, Waterworks Park, Detroit water supply system
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]."