Drainpipe with a filter coating of natural fibres and method of manufacture

摘要

The invention relates to a drainpipe 1 with a filter coating of natural fibres, particularly coconut fibres. The coconut fibre coating is according to the invention made resistant to rotting by the fact that a material which releases heavy-metal ions is combined with the coating material 2. For this purpose an endless filament, for example a copper wire 3 is incorporated into the coating or wound around the coating. Clearly, wires can also be made from an alloy which releases heavy-metal ions. The heavy-metal ions have a negative influence on the habitat of the bacteria responsible for rotting. <IMAGE>