Answer:

1. Check stems missing or not working correctly. Normally yellow on base level, two check stems. Make sure they are fitted correctly. Replace or add check stems.

2. Plugged venturi. Clean out venturi, but do not damage this item. Clean out Level 3 venturi throat and molded venturi nozzle (Do not use anything sharp).

3. Plugged backwash flow control. Clean out backwash flow control.

4. Plugged brine elbow screen. Clean out brine elbow screen.

5. Check all quad rings on Kinetico ensuring all are in good condition.