
Microfiltration (commonly abbreviated to MF) is a type of physical filtration process where a contaminated fluid is passed through a special pore-sized membrane to separate microorganisms and suspended particles from process liquid. It is commonly used in conjunction with various other separation processes such as ultrafiltration and reverse osmos...
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http://en.wikipedia.org/wiki/Microfiltration

the use of microporous filters operating under pressure to remove particles or microorganisms of 0·1-5·0 µm size from process and effluent liquids
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http://www.oasisenviro.co.uk/Glossary%20F%20to%20M.htm
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