I am working on a commercial pool that uses a CAT 2000 controller along with a flow cell, flow sensor and PH and ORP probes. The flow cell is building up a lot of bubbles, as I can see them coming in, making the sensors useless. The hose that feeds the flow cell is attached directly after the pump at an elbow. I don't know if there is a leak on the suction line causing the pump to produce the bubbles going into the tube. Where else can I place this line along the piping system where the water will flow through it. I tried placing it on the return line but it would not push water through the tube. Any help as to how I can stop the bubbles from going in the tube or replacement of the tube along the lines.