| 摘要 |
<p>A filter means (1) to be placed in a drain (not shown) consists of a carrier plate (2), to the under-side of which a filter bag (3) has been mounted. Gravel, pebbles, twigs and the like which should not come into the drain system are caught by the filter bag (3), which can be emptied now and then by removing the carrier plate (2) together with the filter bag (3) from the drain. The filter bag (3) can be made with overflow holes (7) to prevent overloading, e.g. after big downpours.</p> |
