Place the house sponge on the cinder block and place the brick with the carpenter's sponge sand paper and duct tape on top of the sponge.

将家用海绵放在空心渣煤砖上(作桌子用)，上面依次放置砖头、木匠用海绵、砂纸和胶带在海绵之上。

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Grit, fly ash, cinder residue, active carbon, air brick detritus were used as filtering media according to proper proportion for low concentration domestic sewage treatment.

选取粗砂、粉煤灰、细煤渣、活性炭和空心砖粉块作为介质，再按适当的比例配成填料处理柱，进行处理低浓度生活污水的研究。

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