>Don't I need filtration? Basically it depends on whether your leaves can get overbrewed or not. For example most green teas absolutely will get bitter and nasty after a while, so you need some way to get them out. Also using water below boiling somehow makes leaves float more, which again means for green teas brewed at 80*C or so leaving them in the cup is impractical. Most decent black teas, and most dark teas (puerh etc.), are completely fine sitting at the bottom of your cup for half an hou…