Water filters, 19th century

Water filters, 19th century

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Credit: SCIENCE PHOTO LIBRARY

Caption: Water filters. These simple filters are based on the siphon principle, using gravity and siphon suction to draw water through the filters and down into the flasks below. The filters have different effects depending on the size of the pores. Simple filters remove solid particles, while porcelain and charcoal filters can remove smaller elements such as bacteria. Several advances in water filtration technology were made in the 1880s and 1890s. Artwork from the seventh volume (first period of 1891) of the French popular science weekly 'La Science Illustree'.

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