Water cooling bowl vs fairness pitcher
Two intermediate vessels that sit between the kettle and the cup and do opposite jobs. The Korean sukwoo cools water before it reaches the leaf; the Chinese cha hai equalises tea after it has left the leaf.
equipment
What is being compared
Point by point
| Aspect | Water cooling bowl (sukwoo) | Fairness pitcher (cha hai) |
|---|---|---|
| What passes through it | Water, before brewing. | Tea, after brewing. |
| Purpose | To bring boiled water down to a repeatable temperature for green tea. | To even out strength, since the first liquor out of a vessel is weaker than the last. |
| Shape | Wide and open with a lip — a broad shallow layer loses heat quickly. | A small jug, often glass so liquor colour can be judged. |
| Tradition | Korean, in everyday brewing as well as in formal darye. | Chinese, and part of gongfu practice. |
| Substitute | Pouring between two vessels, which is how Chinese and Japanese practice achieve the same cooling. | Pouring straight into cups in sequence and then back-filling, which is less exact. |
| Effect if skipped | Scalded green tea, or an unrepeatable temperature every time. | One cup markedly stronger than another from the same infusion. |
The short answer
The two vessels bracket the brew and together they solve the two problems a careful session has: getting the water right on the way in and getting the tea even on the way out. Neither is essential and both replace a technique that requires more attention than the object does.
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