BOD of drinking water is:

The value of BOD of clean water is

Clean water with BOD value and pH range when it is recommended as a drinking water respectively should be

Clean water with BOD value and pH range when it is recommended as a drinking water respectively should be

The BOD of pure water is ______ ppm.

Greater the BOD of sewage water, its polluting ability is:

If BOD of sample water is a very high,the sample is

BOD of waste water is estimated by measuring the amount of