S2.4.7 For the adult
Clean water
If water looks clear, is it safe to drink?
What this chapter teaches
A cloth filter holds back sand and mud, which do not dissolve. It does not hold back salt or sugar that has dissolved, and it does not stop germs. Clear water is not always safe, so a grown up must boil water before anyone drinks it.
Three questions to ask
There is no one right wording. Listen for the idea.
- What does a cloth filter catch, and what does it let through?
- Why can clear water still be unsafe to drink?
- Who should make water safe to drink, and how?
After the chapter, the learner can
- Separate sand from water with a cloth filter
- Explain why salt that dissolves passes through a filter
- Explain why filtered water still needs boiling before drinking
What they copy into their notebook
A cloth filter holds back sand and mud. Salt and sugar dissolve, so they go through. A cloth does not stop germs. Clear water is not always safe. A grown up must boil water before anyone drinks it.