User: What does percolate mean?
Assistant: Percolation is a way to filter a fluid or other substance through a porous filter media.  Substances that can be percolated are water, coffee, etc.  The trickling effect of these substances through a porous media implies what comes out of the filter media is better tasting than what was before the filter media.  It can also mean it has better quality, less contamination, or reduce acidity.