| 摘要 |
The invention relates to a multi-dimensioned and multiform metal or plastic filter meant to remove solid materials from rainwater flowing in sewage manholes. Such a filter is not marketed in Greece neither abroad. It is a kind of filter made of sheet iron or plastic adequately shaped to retain solid waste up to 4 mm thick and, thereby, to allow rainwater to freely flow into sewers. It is of low cost and great efficiency; it may be used in private or public sites, be frequently replaced, and protect manholes from obstruction what is chiefly very common in wintertime. |
