salt water; brine; brackish water
Refers to water containing salt, often contrasted with 淡水 (fresh water). Can be used for seawater, brine, or brackish water.
See also: 淡水
This pond is salt water, so freshwater fish cannot live in it.
Technology for desalinating salt water is advancing.
淡水 refers to non-salty water like rivers and lakes, whereas 鹹水 is the more technical or scientific term for salt water.
Rare kanji spelling; 鹹 is not a jōyō kanji. The word is usually written in kana or as 塩水.
Common kana spelling, especially when the kanji is avoided.
Compound of 鹹 (kan, 'salty') and 水 (sui, 'water'). The kanji 鹹 is rare and not in common use.