Losing pressure in a portion of the system that is between an upstream Booster pump station and the Treatment plant downstream of it. (See attached) AREA.JPG Initially after leaving the booster station the pressure is fine then reached a point where it loses pressure (the area between the two purple areas is the area that is losing pressure) I have checked for closed valves/pipes, demand data and turned on all pumps at the booster station. Nothing changed the area of pressure loss. Any other suggestions on what I can check to help determine why the pressure loss is happening?