Each point: 1 Mark
To ensure the supply of clean water to all residents the following steps must be taken:
1. Leakages in pipelines of water should be repaired.
2. The main water source must be built in clean surroundings and should be maintained properly.
3. Open defection in water resources by slum dwellers should be strictly prohibited.
4. Chemical methods such as chlorination must be used for purifying water.
5. Water management by the process of chemicals and ultrafiltration membranes to purify drinking water as well as to treat seawater, surface water and waste water.