He mea maikaʻi kēia mea hana no ka wehe ʻana i ka lepo i waiho ʻia ma luna o nā paia o loko o ka pahu, e like me ka sima paʻa, ka paʻakai paʻa, nā kristal paʻakai like ʻole a i ʻole nā waiho ʻana, nā perforation burrs, iron oxideresidues i loaʻa mai ka ʻōpala, i mea e hana ai i nā mea hana a pau. e hele ma ka wehe ʻole ʻia. ʻOi aku ka nui inā loaʻa kahi ʻoki liʻiliʻi liʻiliʻi ma waena o nā mea hana puka lalo a me ka hoʻopaʻa ʻana i loko o ke anawaena, ʻoi aku ka pono o ka scrapping piha ma mua o ka hana hou ʻana. I kēia manawa i loko o ka pūnāwai ʻaila nui ʻo ka ʻoki ʻana i ka paia o loko o ka pahu me ka hoʻohana ʻana i ka ʻōpala pahu he mea pono.