During the washing process, all clothes lose fibers. The fibers break out of the garment’s structure because of mechanical bending and abrasion stress. These broken fibers are typically from 50 µm up to 15mm long and often not thicker than 10µm. Keep in mind: 1µm = 0.001 mm, or about 0.000039 inch.
Our filter mesh is fine enough to filter out even the smallest of these broken fibers. Consequently, we can theoretically filter 100% of fibers (also see: Why haven’t you published a test yet? And who has tested it anyway?).