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Kev ua haujlwm tseem ceeb ntawm cov roj lim yog lim tawm cov impurities hauv cov roj. Yog tias cov roj lim tsis dhau lossis txhaws, qhov kev ua haujlwm tseem ceeb yog: thaum cov roj ntxiv, lub zog yuav qeeb qeeb, lossis nws tsis tuaj yeem pib, lub tsheb pib nyuaj, thiab qee zaum nws yuav siv 2-5 zaug rau ntes hluav taws. Nyob rau tam sim no, feem ntau ntawm cov tshuab nruab nrog ntawv siv cov ntawv tsis siv cov ntawv tshem tawm tau roj roj lim roj . Lub voj voog hloov pauv feem ntau yog 10,000 mais. Yog tias koj ntxiv qhov tsis muaj roj tsawg, nws tsis yog qhov teeb meem los hloov ib qho nrog 15000-20000 kis lus mev. Lub taub lim tau tawm qhov nkag sab hauv thiab lub qhov hluav taws xob, thiab yuav tsum tsis txhob thim rov qab thaum hloov pauv.
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