Aia kekahi ʻano ʻano pā kila kila ma waena o nā pā kila kila, ʻo ia hoʻi ke kila kila microporous nā panela kani. ʻO kēia ʻano kila kila ke ʻano i hana ʻia e nā micropores ma luna o ka ʻili, he mea hoʻonaninani loa.