Having unsuccessfully experiment with paper bags, I came across this filter. It fits "perfectly" normal in 250ml cups, also in 500ml cups you can use it well. Filter in cup - tea pure - water on it. shake after infusion filter, rinse briefly. 1x a week in dishwasher. finished. I take him by the way for ginger (even grated), the holes in the screen are so fine, the land here any fibers from the ginger tea.