No ka mea, hana ʻia nā rotors i ka hao, ʻeleʻele maoli lākou a ke ʻike ʻia i nā minerale e like me ka paʻakai, ʻoi aku ka wikiwiki o ka ʻōpala (oxidization).Hāʻawi kēia iā ʻoe me kahi rotor ʻino loa.
Ma keʻano maʻamau, ua hoʻomaka nā hui e nānā i nā ala e hoʻemi ai i ka palaka o nā rotors.ʻO kekahi ala ʻo ia ka hoʻopili ʻana i kahi uhi Geomet e pale ai i ka pala.