Quotation from: General Science

Written by: Bertha M. Clark


The foul, bad-smelling gases which arise from sewers can be prevented
from escaping and passing to streets and buildings by placing charcoal
filters at the sewer exits. Charcoal is porous and absorbs foul gases,
and thus keeps the region surrounding sewers sweet and clean and free
of odor. Good housekeepers drop small bits of charcoal into vases of
flowers to prevent discoloration of the water and the odor of decaying
stems.

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