Porcelain vs Glass Buchner Funnels:
-Porcelain Buchner funnels utilize your choice of filter paper which allows you to choose the micron size to better fit your filtration needs. Using this method with paper allows the filtered solute to be collected. If you plan to re-use or collect the solid particulate that gets filtered out of your solution, a porcelain Buchner funnel is the way to go. Best for inexpensive, low-risk solutions since this method of filtration can sometimes have particles slip under the sides of the filter paper through to the other side.
-Glass Buchner Funnels will stop 100% of solid particles from making their way through. Use a bed of silica or filter paper for easier cleaning and to collect the filtered particles if desired. Requires a much stronger cleaning method for insoluble particles like carbon and clays. Great for solutions that cannot allow even 1 particle of solids to get through.