This poster is part of a series with the title "Everybody joins the patriotic hygienic campaign to prevent epidemics， Thoroughly defeat the germ warfare of American imperialism, " (彻底打散美帝国主义的细菌战，人人都来参加爱国防疫运动). The slogan on the right-hand side (人人都来参加爱国防病卫生运动) has been cropped.

The poster shows how water gets contaminated, how disease is spread through contaminated water, and how water should be treated to make it safe for consumption.