brine
滷 centers on concentrated salt water: brine, the salty solution used for pickling or preserving.
滷 combines 氵 (water) with 鹵, which likely contributes both sound and the idea of salt or brine. The exact historical development is uncertain.
Water 氵 beside the salt component 鹵: imagine a pool of salty water used for making brine.
For ロ, picture a row of jars filled with brine: row -> ロ, and the salty water lines up in a row.
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alkaline solution