ʻO ka ipu holoi holoi wai ka mea nui i hui pū ʻia me ka ipu hao, ka ʻōnaehana mana uila, ka paepae hana a me nā ʻāpana ʻē aʻe. Hoʻoulu ka mīkini i ka wikiwiki wikiwiki ma o nā hoe i loko o ka ipuhao, i hui pū ʻia nā mea a hui pū ʻia e hoʻokō i nā koi o ke kaʻina hana a ka mea kūʻai aku.
ʻO ka mīkini hoʻohuihui ka mea kūpono i nā huahana wai holoi, e like me ka mīkini holoi holoi holoi, wai holoi lole, holoi lole, etc.The mixing tank e hoʻohui i nā hana o ka huiʻana a me ka hoʻokuʻuʻana, me ka mana hana ikaika, ka hoʻomaʻemaʻe kūpono a me ka uku hana haʻahaʻa.ʻO ia ka koho mua no nā hale hana holoi.