◆ Anthracite
Anthracite is smokeless coal crushed into granules. We use HONGAI coal which produced in northern Vietnam for our products. Anthracite is lighter than filter sand and its porosity is higher than that of filter sand. Therefore, it is used for the upper layer of dual filtration and multilayer filtration to increase the filtration capacity. It can also be used for single layer filtration.
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■ Characteristic
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