Water is made of hydrogen and oxygen molecules. It has no color, taste or smell. Water exists in different forms for different uses like drinking, bathing, cooking and gardening. Water cycles through evaporation and precipitation. Only 3% of water on Earth is fresh water. We should conserve water by turning off taps and not polluting water sources. Water needs purification before use to remove impurities and kill germs. The purification process involves sedimentation, coagulation, filtration, aeration and disinfection to make water safe for drinking.

2. What is water?
Water is made with
tiny molecules of
hydrogen and oxygen
Pure water has no
color, no taste,
doesn’t smell of
anything

3. Forms/ types of water

4. •To drink
•Bath and washing
•Gardening
•Cooking
Uses of water

5. Water cycl

13. When water get
polluted will
unhealthy for all
of us
Only 3% of fresh
water in the
earth

29. Don’t throw garbage here and
there

30. Close the taps when
not use

31. Don’t throw garbage chemicals,
oils directly to the sink

32. Don’t over use the pesticides
and fertilizers

33. Plant trees and save the world

34. Purification of
water

35. 97% salinity water-ocean
3% of fresh water
Fresh water from varies sources may contain
disease causing germs and impurities

36. Water has to be purified before using
River
Lake
Well
Water you drink

37. Water purification plant

38. Steps of purification
•Sedimentation & Coagulation
•Filtration
•Aeration
•Disinfection

39. The process of insoluble particles to settle down is called -
sedimentation

40. Tiny particles of impurities will stick together with the
presence of alum and settled down is called -coagulation

41. Water is passes through layers of charcoal, sand and gravel
to remove remaining suspended impurities –filtration

42. Air is pass through the filtered water in the reservoir by a pump with air
diffuser – Aeration
- Reduces the off taste and odor causing substances
- Improve the taste, palatability of water

43. Adding disinfectants destroy diseases causing organisms inn
water
- Chlorine
- Ozone
- Potassium permanganate
- Uv sterilization

44. This purified water is stored in storage tanks and supply
to our homes through under ground pipes

45. Extra purification of water at our home
Simply fix a filter to the tap
Boiling
Use bottled drinking water

46. When selecting a bottled drinking water
• Check for SLS 894 mark
• Proper sealing
• The manufacturing date & best before date
• Crush or puncture the bottle to prevent the refilling