I roto i te tukanga whakaputa alumina, ka whakamataohia te otinga konutai aluminate mā te wai whakamatao i roto i te whakawhiti wera whānui i te wā o te raupapa pirau, ā, i roto i te raupapa whakakotahitanga, ka maha ngā whara o te mata o te whakawhiti wera pereti nui i whakarewahia i roto i te moenga wai totoka-wai, ka tere ake te tere o te pakaru o te pereti, ka piki tere te whakamahinga papu, ka heke te whakawhiti wera, ka heke te tere pirau o te konutai aluminate me te kounga o te hua. Ina kitea e ngā kaimahi whakahaere taputapu kua rahua te whakawhiti wera, ka tata te whakakore i ngā taputapu. Ko ēnei raruraru ka puta he tiaki kore whakamahere i te pūnaha whakaputa alumina, he pikinga nui o ngā utu whakahaere tīmatanga me te kati o te pūnaha, me ngā mate ōhanga koretake.