Amathrekhi okwenziwa azenzele wona awuhlobo olusanda kuvela lwengoma yokwenziwa ye-granule-free, esetshenziswa kabanzi ezindaweni zezemidlalo, amakolishi namanyuvesi, kanye nezikole zamabanga aphansi nezamabanga aphezulu kanye nezinkulisa. Lolu hlobo lwethrekhi luthuthukiswa kusetshenziswa ifomula ekhethekile, enendawo engokwemvelo eyenza ungqimba olungenayo i-granule lokulwa nokushelela ngemva kokufafaza. Ifaka imibala egqamile, ukumelana nokuguga okuhle kakhulu, ukumelana nemihuzuko, kanye nezakhiwo zokulwa nokushelela, okuyenza idume kakhulu kumakhasimende.