This is a flow-through dissolution equipment. It is a flow-through dissolution method (undefined volume of medium) and the sample is placed in a small cell through which the medium is circulated at 37 °C and at a predetermined flow rate. This flow-through system is a dissolution test used by the pharmaceutical industry to characterise the dissolution properties, active drug release and dissolution of a dosage formulation. The dissolution test is used to formulate the dosage form of drugs and to develop quality control specifications for their manufacturing process.