A system and method for adding a beverage concentrate to a bag shaped to hold fluid while still maintaining the bag for purposes of later dispensing. The device can be coupled to a lattice filter or a ladder filter to form a passband filter with an unbalanced input port and two balanced output ports. There are a number of options for the client to obtain private keys, and where it is generated by the client it may be sent to the server for an escrow service. Considerable advantages, which are described, are realized when using such methods. The pivotal movement of the detector is indicative of a cross-sectional dimensional change of the wire that indicates the presence of a joint.