ʻO ka puka wai wai hydrodynamic Automatic i hana ʻia me ke kila kila, ka alumini a me ka ʻōpala, ʻo ke kaʻina hana mālama wai he kumu kūlohelohe kino, me ka ʻole o ka uila, me ka ʻole o nā limahana ma ka hana, palekana a hilinaʻi. Ke hoʻohālikelike ʻia me ka mana hydraulic a i ʻole nā mea ʻē aʻe, ʻaʻohe pilikia o ka leakage uila a i ʻole hana ʻole me ka mana uila.
