1.Kwancewar ruwa a cikin wuraren sarrafa najasa
2.Gwargwadon lalata ruwa
3.Municipal engineering decolorization
4.Decolorization na bugu da rini da ruwan sha
5.Gwargwadon canza launin ruwan shara
6. Cire fluoride daga gwajin ruwan sharar gida
Lokacin aikawa: Nuwamba-28-2024