A method and a device in optical fiber based spectral filtering. According to one embodiment, a movable, trilayered microcomponent suspended over a substrate is provided and includes a first electrically conductive layer patterned to define a movable electrode. The instrument further facilitates suture knot tying. The undesirable tastes and odors, principally caused by the organic acid impurities, are retained in the filter while the preservative passes through the filter. Alternate cycles of the application and release of pressure result in the pumping of a fluid. Advantageously, the discharge vessel comprises an outer tubular portion with an internal surface and an inner tubular portion with an outward surface.