Walnut shei nzacha bụ ojiji nke filtration nkewa ụkpụrụ mepụtara ọma nkewa akụrụngwa, ojiji nke mmanụ na-eguzogide nzacha ihe - pụrụ iche ukpa shei dị ka a nzacha ajụ, na ukpa shei na nnukwu elu ebe, ike adsorption, nnukwu ego nke mmetọ e ji mara, wepụ. mmanụ na ihe kwụsịtụrụ na mmiri.
Nchacha, mmiri na-esi n'elu ruo na ala, site na nkesa mmiri, ihe nzacha oyi akwa, onye na-anakọta mmiri, nzacha zuru oke. Azụ azụ, onye na-eme ihe na-atụgharị ihe nzacha, mmiri na-agbada elu, nke mere na ihe nzacha na-ehichasị nke ọma ma na-emegharị.