Southeast Supply offers Calibration Columns to provide a convenient and economical means of verifying chemical feed rate from your metering pump. Pump flow rates are determined by installing the Calibration Column on the suction side of the metering pump and performing a 60 second test after closing the main tank suction. Calibration Columns once installed also provide a convenient means for priming pumps and verifying their operation. Calibration Columns feature durable CNC machined PVC fittings and parts.