I roto i te hanganga o te maimoatanga mata whakarewa o te tukanga kiriata kiri phosphate, ka whakaputa i te maha nui o te para phosphate, pērā i te tango i te wā o enei iri i roto i te wai matūriki para pai, ka pā te reira i te pūmautanga me te ma o te wai tank, tika. e pa ana ki te reiti tohu tohu hua.Na reira, he mea tika ki te whirihora i te miihini tango phosphating slag aunoa i roto i te raina whakaputa.