Regardless of the filter, green water (floating algae) should become clear with a UV-C Unit. Only if the pond is old with a lot of organic material on the bottom and an acidified environment will this not work.

The effective life of a UV-C lamp is approximately 7500 hours of operation. With continuous use, the lamp will therefore last a pond season. It is recommended to replace the lamp every spring.

In addition, it is wise not to keep too many fish in the pond.