Orion AQUAfast COD (0-15000 ppm) liquid reagent kit, 25 tests. Usually ships in 3-5 days. $47.24. Quote. Details. The NEW Thermo Orion COD165 thermoreactor will hold 25 round glass vials with 16mm external diameter. It is designed for sample preparation in determining COD, total phosphorus, total nitrogen, total chromium and other parameters in