Water Pollution and impurities in water

In this video lecture water pollution is explained, Learn it from home and answer me..... 1. What are the types of Impurities in water ? 2. How to Eliminate physical Impurities of Water ? 3. Which Chemical is used in Indian households to purify chemical impurities? 4. Enlist diseases caused by Impure water?
Link to Video: 
Semester: 
3
Unit: 
3
Subject: 
MICROBIOLOGY
Paper: 
2