| 摘要 |
The device for filtering the water of a swimming pool comprises a storage vessel 1 containing a granular filter medium 2, 3, comprising an entry opening 4 for the water to be filtered and an exit opening 5 for the filtered water. The filter medium comprises a layer of sand 2 covered by a layer 3 of a granular filter medium of a density lower than that of sand, such as anthracite. The filter medium 2, 3 is separated from the entry opening 4 of the water to be filtered by a filter wall 11 which has openings whose size is smaller than the mean diameter of the particles of the filter medium 3, this opening size being greater than that of the impurities retained in the filter medium 2, 3. Use especially for permitting an increase in the speed of the water during the stage of washing of the filter medium. <IMAGE> |
