| 摘要 |
PROBLEM TO BE SOLVED: To improve the quantity of water to be treated per filter bed and to achieve reduction of a manufacturing cost and shortening the time for completion.SOLUTION: A plurality of raw water dispersion pipes 7 is disposed on a parallel with the sidewall 2b of a filter bed, each of the raw water dispersion pipes 7 is connected to at least one raw water inflow pipe 5 and an air lift pipe 9 is arranged between the raw water dispersion pipes 7 which adjoins mutually. |
