Tea sock vs mesh strainer
A cloth filter bag on a wire hoop against a metal mesh held over a cup. Both separate leaf from liquor and the cloth does something else besides: it is used to pour the brew through repeatedly, which is the technique behind Hong Kong milk tea’s smoothness.
What is being compared
Why these get confused
The sock’s Cantonese nickname refers to its stained appearance rather than to any actual stocking, and the drink is not filtered through hosiery. The staining is what a cotton filter does after a few hundred litres of strong tea.
Point by point
| Aspect | Tea sock (cloth filter bag) | Tea strainer |
|---|---|---|
| Material | Close-woven cotton flannel or muslin on a wire frame. | Stainless steel mesh. |
| What it retains | Fine particles and some of the tea’s own compounds, which is part of the effect. | Leaf and larger fragments only. |
| How it is used | The brew is poured through it repeatedly, which aerates and smooths the drink. | Once, while pouring. |
| Carry-over | Substantial. The cloth stains brown and is not neutral between teas. | None. |
| Care | Rinsed and kept wet; it is replaced when it stops performing. | Washed and dried; it lasts indefinitely. |
| Where it belongs | Hong Kong tea houses and comparable practices in Malaysia, Singapore and Thailand. | Everywhere else, including gongfu, where leaf brews free in the vessel. |
The short answer
The sock is a technique as much as a filter, and substituting a mesh strainer for it in a Hong Kong milk tea removes the repeated pouring that makes the drink what it is. In every other context the mesh strainer is the better tool, precisely because it is neutral.
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