Canadian Spa Company

This is an instructional guide showing how to perform a V2 Filter Port Flush of the Portable Control Unit with a garden hose.

If your Portable Control Unit (PCU) is making a grinding noise while it is running (even with water in it), it is possible that some debris has entered the Filter Port section causing the grinding sound. 

Hair or other debris might be trapped inside.

Note that it is normal for the PCU to make a "grinding" or "clunking" sound when the pump is activated and will go away once it becomes primed and flow is detected out of the heater port in the tub.

Back flushing the V2 PCU Filter Port is a good practice to carry out every few months to prevent getting any hair or debris trapped inside of the Filter Port.