The system automates several time consuming and laborious tasks involved with the BOD measurement process. Capped bottles are loaded into racks and placed on the system bed, which has a 60 bottle capacity. The system processes two bottles simultaneously. Caps are removed before the bottles are diluted by filling to a set level. DO probes are dipped into the bottles and the sample is stirred whilst a reading is taken. The caps are replaced into the bottles and the probes are washed between samples. A full 60 bottle process takes approximately 60 minutes depending upon the amount of dilution water that is added.