(of liquid) to settle / to become clear
澄
=
氵
+
登
:
Don Quixote (d) built a complex tower of water bottles (氵) in the engine's bathroom ((e)ng4). He set it up so that the water from one bottle is flowing into the next, and as impurities settle (澄) on the bottom of the bottles the water gets clearer and clearer (澄). To retrieve the cleanest water he has to climb (登) to the top of the tower though.