TSUMUGU · B2 (est.) · 字
濾
濾 ＝ 氵 ＋ 慮
ㄌㄩˋ · lǜ
verb — to filter, strain
字源 FORM — what the parts do
氵義water
Water (氵) with 慮 lǜ, the weighing of thought. Pour the liquid through and hold back what shouldn't pass — to filter, to strain (過濾, 濾水). The thinking part suits it: a filter sorts, keeping the clear and stopping the grit. From the act, the things that do it: 濾紙 (filter paper), 濾鏡 (a lens-filter).
故事 STORY — a scene to remember it by
渾水（氵）倒過一層紙，雜質被攔下，滴下來的是清的。
Cloudy water (氵) poured through a sheet — the grit held back, what drips out runs clear.
字源記憶法
意 · Meanings
(本義)過濾、濾水— to filter, strain常用
→濾紙、濾鏡— filter paper; a filter (lens)
(本義) original meaning · → ⇒ each arrow = one more step of extension