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MB3 142b: Pouring Liquids on Shabbos (319:13-15)
It is prohibited to use a filtering agent when pouring from one container to another. Pouring slowly so the dregs remain in the original container. Removing some of אוכל with the פסולת.
Removing a tea bag from a teacup. Separating fat from gravy.
Separating the egg white and yolk.