Occasionally, you may encounter a mixture containing very fine particlesof a by-product or other unwanted solid material that passesthrough filter paper or clogs the filter paper pores and prevents orimpedes filtration of the desired material. The use of a filter aid suchas Celite facilitates the separation. Celite is a trade name for diatomaceousearth—a finely divided inert material derived fromphytoplankton skeletons—which neither clogs the pores of filterpaper nor passes through it. A filter aid should be used only for amixture where the filtrate will contain the desired material and thesolid adhering to the filter aid will be discarded.
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