COD (Chemical Oxygen Demand or in the Dutch Chemical oxygen demand) is one of the indicators that give insight in the status of the water pollution. When the aquarium is dirty, or when too many fish are present, we see a high level of COD. Micro-organisms such as bacteria may be the pollution in the water break down. If there is too much organic material in waste water, then there is relatively too little oxygen in the water for any other organisms in the water.
Contents: 5 tests
* Not suitable for seawater