1. Water use and treatment
5 Stages

2. Over view
4. Filtration
The ‘settled sewage’ is sprinkled onto large circular beds, two metres deep, filled with stones or clinker.. bacteria and other tiny creatures feed on the organic material. This produces a sludge which settles out in special humus tanks.
2. Grit and Sand Channels .The sewage then flows along wide, deep channels where grit and sand sink to the bottom. 1 3
5. Final Settling Tank
Small and fine particles settle out leaving the cleaned water, or effluent, to
flow back into rivers and streams. 2
1. Screening
Metal screens sieve out large objects such as wood, cans and plastics.
3. Sedimentation Tank
Here, solid particles in the sewage settle at the bottom of the tank to form a thick sludge. 4 5

3. Collection
Uses
Treatment

4. We all use water
Water in our House

5. Collecting Water
Collecting Water

6. We all use water
Water in our House