The Kalita Wave Filters give the Kalita Wave Drippers their style and functionality. The filters are designed to sit suspended above the bottom of the dripper while increasing temperatures stability by keeping most water contact away from the outer wall of the dripper. We recommend thoroughly rinsing each dripper before use. This can be done by pouring hot water directly into the middle of the filter, until the water fills to the top, and let it drain back out. Each pack contains 100 filters.