Table 5: Comparisons of various treatment processes with regard to input requirments,

Processes

Costs for

Level of skills of operating personnel

Materials/Procedures necesarry for operation

Construction

Operation

Sedimentation

1-2

1

1

Regular Cleaning

Coagulation with

2-3

3

2-3

Regular supply with chemicals, monitoring

chemicals

Coarse filtration

1-2

1

1

Cleaning at longer intervals

Rapid filtration (conv.) 3

3

3

Frequent back-washing

Slow sand filtration

2-3

1

2

Regular cleaning

Chlorination

1-2

3

2

Regular supply with chemicals, monitoring

1: low, 2: medium, 3: high