A flow filter is supplied by a pump located in the water. The filter is the highest point in this cleaning circuit, from where the water flows back into the pond. The cleaning of the water is handled by sponges inside the filter, which over time also become a home for diligent microorganisms. The advantage of flow filters is that they are easily accessible above ground, making cleaning and maintenance quick and straightforward. The BioSmart UVC 16000 from OASE is an effective biological-mechanical flow filter for clear and healthy pond water. It is suitable for ponds up to 16 m³, with fish stocking up to 8 m³, and for koi up to 4 m³. The flow filter can be buried up to one third of its height. The cleaning of the polluted pond water is done through special active filter sponges. The UVC technology combats green algae and pathogens. The flow filter features a temperature and pollution indicator. For cleaning, the filter sponges can simply be squeezed out using a practical cleaning mechanism. The integrated bottom drain allows for the disposal of dirty water. The flow filter has an inlet with a universal stepped hose fitting from ¾ inch to 1½ inch and a DN 75 outlet. The various sponges effectively break down toxic by-products such as ammonium, ammonia, nitrite, or nitrate. The integrated UVC unit in the filter ensures the rapid removal of algae and pathogens. The thermometer always indicates the current water temperature.