Efere & etiti okpomọkụ Exchanger bụ nke nwere efere mbufe okpomọkụ (afere ígwè) nke a na-emechi ya site na gaskets, jikọtara ọnụ site na tie mkpara nwere akụ mkpọchi n'etiti efere etiti. Oghere ọdụ ụgbọ mmiri na efere ahụ na-etolite ụzọ na-aga n'ihu na-aga n'ihu, mmiri ahụ na-abanye n'ime ụzọ si na ntinye ma kesaa n'ime ọwa mmiri na-asọba n'etiti efere ọkụ ọkụ. Mmiri abụọ a na-asọ na counter current. A na-ebufe ọkụ site n'akụkụ ọkụ gaa n'akụkụ oyi site na efere na-ebufe ọkụ, a na-eme ka mmiri ọkụ na-ekpo ọkụ na-ekpo ọkụ ma na-ekpo ọkụ.