You shouldn’t need to filter high quality tea, it should speak for itself. A little leaves at the bottom are just snacks. if you prefer it filtered thats fine, just totally unnecessary. Really the limiting factor is actually water quality, but there are people experimenting with water recipes to make the best tea. And they usually share their recipes and the majority of the minerals are widely available and it’s just a lot of distilled water. The equipment is what’s most expensive, but a cheap gaiwan or even a small bowl and you’re good to go.