I've found the best success with teapots where the basket takes up as much space as the pot itself - then taken the basket out when it's brewed.
Like this one:
https://www.hario.co.uk/chacha-kyusu-maru-teapot-700ml.html
@NotThamesWater started
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I've found the best success with teapots where the basket takes up as much space as the pot itself - then taken the basket out when it's brewed.