2. How would you get drinking water from this river? DistillationFiltration

3. Filtration - removing undissolved solids from a liquid by passing it through a porous material. – separates particles based on size The liquid that passes through a filter is called the filtrate. The material that does not pass through a filter is called the residue.

4. Filtrate: water with dissolved coffee Residue: coffee beans Examples of filters Filtrate: air Residue: insects

5. Examples of filters Filtrate: water Residue: fish Filtrate: air Residue: poisonous gases

6. Earth’s Natural Filter … with dirt?? Video Flash animation

7. Filter Challenge! Everyone is given: 200ml dirty water 30 cm scotch tape Top of water bottle Choose 4 of 5 materials: 100 ml Sand 100 ml Gravel 1 Cotton ball One piece of photocopy paper One piece of tissue paper