1. Tom qab kev sim nruj, peb xyuas kom meej tias cov khoom zoo mus txog thoob ntiaj teb cov qauv thiab ua tau raws li cov neeg siv khoom xav tau.
2. Yuav cov khoom siv raw khoom zoo thiab koom tes nrog cov neeg muag khoom uas tau koom tes nrog ntau tshaj 5 xyoos.
3. nruj me ntsis tswj cov txheej txheem ntau lawm, thiab 8 cov neeg soj ntsuam zoo ua cov kev kuaj xyuas thawj zaug kom tshem tawm cov khoom puas los ntawm qhov chaw.
4. Ua raws li cov khoom lag luam lub tswv yim ntawm kev tiv thaiv ib puag ncig, tsis muaj phosphorus, thiab siab concentration.
5. Muab CMA, SGS lossis cov ntawv xeem thib peb los ntawm cov neeg siv khoom.