Cosmetic material adopt natural sisal without poison and contamination.
抓面采取无毒无污染的天然剑麻绳。
With sand as filtration material, thinner bed and less contamination at the bed bottom will result in higher turbidity of effluent.
在砂过滤中，滤层厚度薄，底层含污量少，出水浊度高。
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