At present, there remain 2 low regions - center of alum in Bac Dong and Bo Bo - Mo Vet. There are 2 cycles of acid water in early rainy season (April to July) and the end of rainy season (November to January) every year. To reduce disadvantages for agricultural production, it is necessary to continue investing and developing irrigation systems to create source, to apply cropping systems, new crop. . . suitable for natural conditions and market mechanism. As reclaiming, it should pay closely attention to lead the alum water source to downstream, damaging the production of riverside regions.