1. Natural Sciences and Technology Grade 6
Term 2: Matter and Materials
Processes to Purify Water
(ppt 1)

2. Topic 6 Processes to Purify Water
Clean Water
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

3. Why is clean water important?
Clean water is a precious resource.
People need clean water to drink, cook and wash.
Animals and plants also need clean water to grow and be healthy.
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

4. Remember how we can separate mixtures?
Remember what you learnt about separating mixtures?
Can you list some of the separation methods we looked at?
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

5. Methods to separate mixtures
Some of the separation methods are:
filtering
sieving
settling
decanting
hand sorting
Which of these methods can be used to clean water?
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

6. Gr. 6 Natural Sciences and Technology – Term 2, Topic 6
How can we clean water?
Some of the ways that we can clean water are:
filtering
settling
decanting
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

7. Gr. 6 Natural Sciences and Technology – Term 2, Topic 6
How can we clean water?
Some of the ways that we can clean water are:
filtering
settling
decanting
boiling
adding chemicals (like bleach - Jik)
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

8. Gr. 6 Natural Sciences and Technology – Term 2, Topic 6
How can we clean water?
Some of the ways that we can clean water are:
filtering
settling
decanting
boiling
adding chemicals (like bleach - Jik)
using a still
Remind learners that they did their own experiment to learn how to use the power of the sun to purify water.
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

9. Gr. 6 Natural Sciences and Technology – Term 2, Topic 6

10. Purify water with Jik
A little chlorine / Jik in water kills bacteria safely.
A teaspoon of "Jik", "Milton", or "Javel" bleach will purify 10 litres of water in an hour.
Two teaspoons of bleach will purify 10 litres in 30 minutes.
Gr. 6 Natural Sciences and Technology – Term 2, Topic 6