Only plant pond filtering

Enjoyed my pond for years and never have a pond filter and connected pump used by the biological purification. This year I came to enschluß thoroughly overtake my pond and to revise, for all Plnzen have been banned from the pond. To compensate for the clarification pond I decided a pond filter system to install and manage them there after a few days it became the Erfolgein, thanks to the pump that was in the box