Network fabric events may be utilized to proactively handle network path outages. 25 inch and secured by its proximal end to the distal end of a handle. The message bodies of the messages are compared. Thus, frame destruction or duplication is prevented. In one embodiment, an FIR filter is constructed using the delay line. In the system, when spent sulfuric acid that is discharged or collected at a discharge source is transported by a carrier unit and used at a user office a concentration of the spent sulfuric acid is measured andor adjusted at least at one of the discharge source, the carrier unit, and the user office.