Ask five winemakers the color of the sky, and you will get six answers. Ask them how or why they filter wine, and you will get similar results. It is soon obvious the "book of filtration" will never be written; and some brave souls do not filter at all. That said, filtration is for arresting fermentation, clarification, fining agent removal, bio-reduction, polishing and bottling preparation. For small- to mid-sized wineries that filter, the best way to prepare wine for the bottle is s...