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aid sewer, at least two hundred feet from said pond, within three months from the passage of this Act; and thereafter no person or corporation (municipal or other) shall discharge or divert into said pond, any sewage or offensive matter, waters or substances containing such properties or of such quality, as shall of themselves, or in connection with other matter, create a nuisance in Mystic Lower Pond, or endanger public health; but nothing herein shall be construed to prohibit the City of Boston's discharging such water as shall be collected in its said sewer into Mystic Lower Pond, after said City shall have purified, cleansed and freed the said waters from all offensive, contaminating, noxious and polluting properties, and substances, so that the waters shall not of themselves or in connection with other matter, create a nuisance therein or endanger the public health: provided that such waters so purified shall flow for a distance of at least two hundred feet immediately before the