天然彩砂色差很容易发现，所以要求出厂的产品要保留色样，统一搅拌。
Natural sand color is very easy to find, so the requirements of the factory's products to retain the color, uniform mixing.
预处理系统一般包括原水泵、加药装置、石英砂过滤器、活性炭过滤器、精密过滤器等。
Pretreatment system generally includes the original pumps, dosing devices, quartz sand filter, activated carbon filter, precision filter and so on.
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