Simple classroom water filter
Tools:Drill and 1/4" drill bitScissorsBox Cutter2 Liter Bottle (2)Measuring CupsMeasuring SpoonsFunnelColanderPan 6" X 10"Materials:Wash Cloth (1)Cotton Balls (8)Coffee Filters (4)Small Gravel 1/2 cupFine Sand 2/3 cupCharcoal 2/3 cupCorn Starch 1 TablespoonTea Granules 1 TablespoonPotting Soil 1 cupWater 8 cupsSteps - read more here.
