Muaj ntau ntau hom lim. Nyob ntawm ib puag ncig thiab kev pom zoo, lawv tuaj yeem muab faib ua pawg hauv qab no:
1. Cua Lim: Siv rau hauv huab cua purification thiab muaj plua plav tshem tawm, lawv lim tawm cov plua plav thiab cov teeb meem ntawm huab cua.
2. Cov lim dej kho dej: Siv hauv kev kho dej thiab kev tiv thaiv ib puag ncig, lawv lim tawm cov khib nyiab, cov khib nyiab, thiab cov organic teeb meem los ntawm dej.
3. Cov lim dej kho mob: Siv rau hauv kev kho mob, chaw kuaj mob, thiab lwm qhov chaw, lawv lim tawm cov kab mob, kab mob, thiab kab mob los ntawm huab cua.
4. Cov Khoom Siv Khoom Noj: Siv hauv kev ua zaub mov thiab dej haus, lawv lim tawm impurities thiab hais los ntawm cov khoom siv raw.