Kuchuluka kwa ntchito:Series GYW vakuyumu okhazikika maginito fyuluta ndi yamphamvu mtundu kunja kusefa zingalowe okhazikika maginito fyuluta ndi chakudya chapamwamba, amene makamaka oyenera kutaya madzi m'thupi zipangizo maginito ndi coarse particles.
Ntchito Yofikira:Amagwiritsidwa ntchito kwambiri m'nyanja zazikulu, zosungira, malo, madzi, zimbudzi zamatawuni, kuchotsa eutrophication ya nayitrogeni, phosphorous ndi cyanobacteria.