Kev ua haujlwm sab nraum zoov tau muab faib ua ntau hom. Piv txwv li, kev lag luam tshuaj yuav tsum hnav khau kev nyab xeeb thiab cov khaub ncaws tiv thaiv uas tiv taus cov kua qaub thiab alkali. Kev tsim kho kev lag luam yuav tsum hnav cov khau tiv thaiv kev nyab xeeb thiab cov kaus mom kev nyab xeeb. Txawm tias cov tub ceev xwm kev ruaj ntseg muaj Rau khau tshwj xeeb kev nyab xeeb, kev lag luam tiv thaiv hluav taws xav tau tshwj xeeb hluav taws kev nyab xeeb khau tiv thaiv khaub ncaws, thiab lwm yam. Hauv luv luv, txhua txoj hauv kev ntawm lub neej txawv, nyob ntawm qhov xwm txheej.