Multistage nfuli bụ elu mmiri-ejizi ngwaọrụ e mere iji napụta elu-nrụgide arụmọrụ site tinye n'ọrụ otutu impellers n'ime otu mgbapụta casing. A na-emezi nfuli multistage iji rụọ ọrụ nke ọma n'ọtụtụ ngwa nke chọrọ ọkwa nrụgide dị elu, dị ka mmiri, usoro mmepụta ihe, na usoro nchebe ọkụ.