WATER
Water is a common chemical substance that is essential to all known forms of life. In typical usage, water refers only to its liquid form or state, but the substance also has a solid state, ice, and a gaseous state, water vapour.
Water cycle
The movement of water around, over, and through the Earth is called the water cycle. We can consider the starting point and ending point are the same.

Water is Essential for Life
It covers 71% of the earth's surface and makes up 65 % of our bodies. Everyone wants clean water-- to drink, for recreation, and just to enjoy looking at. If water becomes polluted, its loses its value to us economically and aesthetically, and can become a threat to our health and to the survival of the fish living in it and the wildlife that depend on it.

Problem
-80%of infectious diseases.-6 million people die each year.-3 million die from water_related diarrhea alone most of those diving are small chilern.

How does water pollution occur?

Although some kinds of water pollution can occur through natural processes, it is mostly a result of human activities.We use water daily in our homes and industries.After we have used it and contaminated it.most of it returns to these locations. The used water of a community is called wastewater, or sewage. If it is not treated before being discharged into waterways, serious pollution is the result.

Water analysis
Physical analysis

(1)Turbidity.
(2)Colour.
(3)Taste,Smell.
(4)Total suspended solids.

Chemical Analysis
Nitrogen forms:
(1)Amonia

(2)Nitrite

(3)Nitrate
Microbiological Analysis
(1)Bacteria.
(2)Algae.
(3)Protozoa

Water Treatment
Commom Water problems and treatment
(1)Bacteria
Disinfecation

(2) Fuel products
Carbon Filter

(3) Hard water
Water Softner
(4)Metals
Reverse osmosis unit or distillation
(5)Pesticides
Reverse psmosis unit or distillation
(6) PH
Neutralizing filter

(7)Taste and odors
Carbon filter
(8) Ion particles
Water softner or iron filter

(10) Hydrogen Sulfide gas
Oxidizing Filter Followed by a carbon filter or Chlorination