Filtration

(noun.) the act of changing a fluid by passing it through a filter.

(noun.) the process whereby fluids pass through a filter or a filtering medium.

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• In filtration, the water is forced through porcelain or other porous substances which allow the passage of water, but which hold back the minute foreign particles suspended in the water. 伯莎M.克拉克. 科学通论.
• In many cities the filtration system is so good that private care of the water supply is unnecessary. 伯莎M.克拉克. 科学通论.
• During the process of filtration the chicle is also sterilized, and comes from the machine as pure as distilled water. 佚名. 神奇的知识之书.
• The filtration plants owned and operated by large cities are usually safe; there is careful supervision of the filters, and frequent and effective cleanings are made. 伯莎M.克拉克. 科学通论.
• Streams which flow through populated regions are apt to be contaminated, and hence water from them requires public filtration. 伯莎M.克拉克. 科学通论.
• Cities using such a water supply thus have the double expense of pumping and filtration. 伯莎M.克拉克. 科学通论.
• By this system great rapidity of filtration is obtained, the rate being 120,000,000 gallons a day per acre. 威廉·亨利·杜利特. 世纪发明.

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