Zosefera zodzitchinjiriza ndi mtundu wa zida zochizira madzi zomwe zimagwiritsa ntchito sefa yotchinga kuti iwononge zonyansa m'madzi, kuchotsa zinthu zoyimitsidwa ndi zinthu zina, kuchepetsa turbidity, kuyeretsa madzi, kuchepetsa dothi, mabakiteriya ndi algae, dzimbiri, ndi zina zambiri. , pofuna kuyeretsa madzi ndi kuteteza ntchito yachibadwa ya zipangizo zina mu dongosolo.Imakhala ndi ntchito yosefa madzi aiwisi ndikuyeretsa zokha ndikutulutsa zosefera, ndipo njira yoperekera madzi yosasokoneza imatha kuyang'anira momwe fyulutayo imagwirira ntchito, yokhala ndi makina apamwamba kwambiri.