Why do people use filtration media?

Filter media is a porous, often inert, solid powder used to coat a simple 2D filter membrane (e.g., filter paper), built up as depth filtration aid to remove very fine solid particles from liquid suspension during production & purification of oils, botanical extracts, foods & beverages, pharmaceuticals, cosmetics, and other goods, mainly to clarify or “polish” liquid solutions and/or purify their solutes.

Adsorbent media have “activated” properties like functional surface chemistry, charge polarity and specific pore size, making them suitable for additional applications like removing color bodies (pigments, dyes, etc.), heavy metals, pesticides, and many toxic or otherwise undesired impurities. The most precisely refined adsorbents are used as stationary phase in chromatography to purify and isolate individual compounds from chemical mixtures.