Grade 4 · Science · Lesson 34

Create a mini water filter

Water found in nature is rarely pure — it carries tiny particles of soil, sand, and other substances. Filtration is a physical separation method that removes solid particles from a liquid by passing the mixture through a filter medium. The filter allows the liquid and very small dissolved particles to pass through while trapping larger solid particles.

What this lesson teaches

1Explain what filtration is and how it separates mixtures by particle size
2Describe the layers of a water filter and the role of each material
3Distinguish between pure water and impure water
4Identify water as both a mixture and a solvent in solutions

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