Parameters Unit Limiting Values
Feed water TDS ppm 500-1300 max.
Suspended solids ppm Less than 5
Turbidity NTU Less than 5
Total hardness ppm 500 max.
Free chlorine ppm Less than 0.5
Silica ppm Less than 20
Heavy metals ppm Less than 0.5
Iron and manganese ppm Nil
Oil and grease ppm Nil
Temperature Degree C 40 degree max.