These filterers are filled with bone-black, a substance resembling pulverized charcoal. [Please select]
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Pipes convey it from thence into five filterers, holding several hogsheads each. [Please select]
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Through these five filterers it passes in succession, and then runs into a large reservoir underneath the ground floor, from whence it is carried up, by means of a steam pump, into a clarifier made of sheet iron, where it is heated by steam until it boils. [Please select]
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