Installation of the YSI 6601 flow cell is easy. Simply unscrew the bottom plate from the calibration cup assembly and screw the flow cell module into the bottom of the calibration cup. Once secure, water can be pumped to the flow cell with a user-supplied pump. Water enters through the bottom of the flow cell, and passes through a diffuser plate. The water will drain down the center tube of the flow cell after the cup is filled. This design ensures that flow is distributed evenly through the cell, eliminating dead zones of no flow along the sides.