Cov lim dej muaj ntau yam kev siv thoob plaws ntau yam. Cov hauv qab no yog qee qhov kev siv ntau:
1. Kev tsim khoom: Cov lim tuaj yeem siv rau cov khoom siv raw thiab cov khoom pom hauv kev lag luam xws li roj hmab, yas, textiles, thiab tshuaj lom neeg.
2. Kev Kho Dej: Cov lim dej tuaj yeem siv rau cov dej kais dej, dej ua haujlwm, thiab kev kho dej phwj tuaj.
3. Cua Purification: Cov lim yuav siv tau rau hauv tsev cua purifiers, hauv nruab nrab cua txias, thiab cov tshuab tso pa tawm.
4. Kev Kho Mob: Cov lim tuaj yeem siv rau hauv chav ua haujlwm, chav kuaj, thiab cov tsev kho mob.