Comparison Different Materials for Water Filter

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Water Filter
Description: We try to explore what materials have the best capability for filtering. We have tested several materials for filtering for example sponge, towel and active carbon. Sponge and towel may filter some slag with a certain size, however, if the slag has any colour or dye, it cannot absorb with those filters but active carbon can.
School: Sha Tin Public School (P5)