filter « Back to Glossary IndexA screening device or porous substance (sand, pebbles, and charcoal) used as a strainer for removing solid material from liquids.Related Articles: EXPERIMENTS AND ACTIVITIESWetland – nature’s purification (filtering)GOOD AND BAD GUYS AMONG BACTERIAMacroinvertebrates and the Food They EatWhen a River Passes Seven Stones…« Back to Glossary Index Materials and Worksheets Share: admin Previous post evaporation 26/10/2018 Next post fresh water 26/10/2018