海かい水すい淡たん水すい化か

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Meanings

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noun

seawater desalination

Technical term for the process of removing salt from seawater to produce fresh water.

海sea, ocean

水water

淡thin, faint, pale

化change, take the form of, influence

淡たん水すい化か
淡水化 is a broader term for desalination or freshening of any water, while 海水淡水化 specifically refers to seawater.

Compound of 海水 (seawater) and 淡水化 (desalination).