wreiokwefo

1. Water Pollution
• Addition of harmfull substances to water is called water pollution.
• Harmfull & unwanted substances in water are called Pollutants.

2. TYPES OF POLLUTANTS
• DISEASE CAUSING:
BACTERIA , VIRUS ,OTHER MICROORGANISM
• WATER SOLLUBLE:
ACID AND SALTS
• OTHER:
• OIL , PLASTIC , AND PESTISIDES

3. HARD AND SOFT WATER
• The water which gives rich lather with soap is called soft water.
• The water we use in house is soft water.
• The water which does not give good lather with soap, but forms
curds is called hard water.
• Sea water is hard water.
• Water becomes hard when chloride, sulphate or carbonate salts
• dissolve in it.

4. FILTRATION
• THE PROCESS OF REMOVAL OF IMPURITIES AND UNWANTED
SUBSTANCES (POLLUTANTS) FROM WATER THROUGH FILTER PAPER
IS CALLED FILTRATION.
BOILING
THE PROCESS OF PURIFYING OF WATER THROUGH ANY HEAT SOURCE
IS CALLED BOILING.

5. CHLORINATION
• THE PROCESS OF PURIFYING OF WATER THROUGH CHLORINE BLEACH
IS CALLED CHLORINATION
• THIS METHOOD IS EASY AND CHEAP.