Finum Filter Stick The finum® Filter Stick is a practical tea filter holder and is suitable for nearly all filter and cup/mug dimensions. The stick is reuseable. 1. Pierce the filter on the "Filter Stick" approx. 1 cm (3/8") across the opening. 2. Open up the filter on the "Filter Stick". 3. Place the "Filter Stick" across the rim of the mug/cup. Add the desired amount of tea. 4. Pour hot water through the filter. 5. Wait for the tea to steep. 6. Discard the spent tea-leaves and filter. Keep the "Filter Stick" for later use.