Qhov hnyav -} sau tshuab

Qhov hnyav -} sau tshuab

Qhov hnyav -}}}}}}}}}}}}}}}}}}}}} sau cov nplai los ntsuas qhov hnyav ntawm cov khoom lag luam raug kaw rau hauv lub thawv. Hom tshuab no feem ntau siv rau cov khoom uas muaj qhov tsis sib xws, xws li cov khoom lag luam granular thiab hmoov. Cov khoom lag luam muaj nyob rau hauv kev cia siab lossis tank saum lub khob ntim cov puv no, thiab raws li lub tshuab xa tawm hauv qab cov khoom lag luam.