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。
2
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.