ST-COD ( sealed tube-chemical oxygen demand) tests are ready for use.

• Suppression of chloride interference; up to 1000 mg/L (LR and MR);up to 10000 mg/L (HR)
• Mercury-free tube tests, in absence of chloride interference
• High range (HR) tubes (0 to 15000 mg/L O₂) are suitable for waste water testing

* without chloride removal.