Flowing through the filter material is a type of 4 granite blocks, cement, brick and roof tile. Arrangement of filter material in the FAI within the pond experiment number fai-5.
Flow through the filter material, four types of granite blocks, cement, bricks and roof tiles. Sort, filter material to form a faction within five experimental pond dam.
Flow through the filter material 4 type is a granite block, cement, bricks and tiles Sort filter material in the form of 5 weir weir in experimental ponds.