Introducing the pondoclear set 4000 a complete filter set from oase that is great value without compromising on qualityr filter sets with clear water guarantee for ponds up to 4 000 litres without fish stock and up to 2 000 litres wish fish stockr with 7 watt uvc clarifier for eliminating suspended algaer multi stage filter system with different filter stages filter sponge bio surface elementsr high performance uvc filter pump unit with 4 mm filter slots 3 m hose and all connections