A na-echekwa mmanụ lubricating, ihe mmetụta turbidity mmanụ hydraulic, mmanụ lubricating, mmanụ hydraulic, wdg. na-echekwa ma ọ bụ rụọ ọrụ n'ime otu akpa mmiri mmiri.Mgbe àgwà mmanụ mmanụ, mmanụ hydraulic, wdg na-agbanwe n'ihi ọrụ ogologo oge, àgwà mmanụ ya ga-agbanwe, nke ga-emetụta mgbaàmà na-enweta ike mgbe niile, wee metụta mmepụta nke mgbaàmà eletrik.