Ko te waro whakahohe he rauemi whakauru whaihua e mohiotia ana i te ao, i te timatanga o te "World War I", i whakamahia ki roto i nga kopare hau.Ko te waro whakahohe e whakamahia nuitia ana i roto i nga motuka me te horoi hau o roto.Ko te waro whakakorikori he rauemi waro maiengi, na tona hanganga mokowhiti he nui te mata o te mata, no reira he ngawari ki te whakapiri atu ki nga hau paitini, kino kino ranei i te rangi kua ki tonu, ko te whakaurunga kaha o nga kohao waro whakahohe huri noa i te mara kaha ka tae tonu ki te poka momi, ngota ngota hau paitini no reira he kaha te kaha o te waro kaha ki te whakauru ko te tikanga matua hei tango i nga parahanga hau.Kei te nuinga wehea hangarau waro adsorption whakahohe ki e rua kāwai: adsorption tinana me adsorption matū.