Kyusu vs a basket infuser for Japanese green tea
This is the single most consequential equipment mismatch in everyday tea, and it produces a specific complaint: sencha that tastes thin and simultaneously bitter. The cause is a filter, and no adjustment to time or temperature fixes it.
equipment
What is being compared
Why these get confused
Cloudiness is the tell. It is the intended result of deep steaming, and reading it as poor filtering leads people to buy finer filters, which is the opposite of the fix.
Point by point
| Aspect | Kyusu | Mug infuser basket |
|---|---|---|
| The filter | A fine ceramic mesh across the whole spout wall, designed for fine leaf. | A perforated basket, designed for leaf that stays whole. |
| Deep-steamed sencha | Poured off cleanly. Fukamushi leaf breaks down considerably, and this is what handles it. | Clogs. Flow slows, the leaf packs against the mesh, and the cup under-extracts. |
| Leaf room | The whole pot. The leaf circulates freely. | Whatever the basket allows, which is usually less than the wet leaf wants. |
| Multiple infusions | Two or three, with the second shorter than the first. | Rarely satisfying, because the leaf never opened properly in the first place. |
| Cloudiness in the cup | Expected with deep-steamed tea, and the fine particles carry much of the body the style is chosen for. | Read as a fault, and often ‘fixed’ by using less leaf, which makes the thinness worse. |
| Cost | Moderate. | Low, which is why it is what most people already own. |
The short answer
If sencha has consistently disappointed, change the vessel before changing the tea. A kyusu is the one purchase in this catalogue that reliably changes a category from ‘not for me’ to ‘worth exploring’.
Not a ranking. TeaHQ publishes no ratings and does not know your occasion.