The innovative, patented 3D fiber structure of sera pond crystal clear Professional very quickly removes even smallest particles above 10 �m (such as floating algae or sludge).

Unlike common filter wool, the filter balls keep their shape and can be washed out several times. They are 80% reusable after washing out.

Maximum filter performance can be achieved by combination with a UV-C lamp and/or coagulants such as sera pond crystal.