Watercourses have a natural height difference. Pressure filters receive the water via the watercourse pump, clean it and convey it back up to the source thanks to the constant water pressure. The actual filter is buried up to the cover outside the water. The BioPress filter set with pump is designed for smaller bodies of water of up to 10 m³ and is very easy to maintain. FiltoClear is available as a single filter or as a set. They are suitable for bodies of water up to 30 m³. They have better performance and a higher pumping capacity, but are just as easy to operate as BioPress filters. Each model comes with a clear water guarantee from OASE, and some are also suitable for small koi ponds.