Raws li "kev xav ntawm Ministry of Leading cov dej num ntawm cov chaw ua haujlwm ntawm cov chaw lag luam uas muaj ntxiv dag zog rau cov av lag luam Tshaj tawm rau peb lub hlis twg ntawm 2020.
Tam sim no peb cov khoom siv dej kho dej yog muag kub. Xws li: TCCA, SDIC, calcium hypochlorite, caustic dej qab zib, PAC. Nug, pls xav tiv tauj peb.
