The Biochemical Oxygen Demand (BOD) test is widely used by environmental monitoring labs to test inland waters, sewage and sewage works discharges.
In 1908, the test was selected in the UK as the definitive test for organic pollution of inland waters. It takes five days to complete, has a narrow analytical range, no clear meaning, isn’t accurate, can’t be repeated to check abnormal results and can’t easily be automated. Even so, in spite of all these drawbacks and after 103 years, it is still going strong even though it easily passes the dateline set by many antiques fairs.
The continued use of the BOD test is due entirely to government and quasi-government environmental bodies - the public purse in other words. You thought science was about progress?