With its predecessor, the Professional, EHEIM introduced the first series of external filters with a square base shape. Advantages: space saving (because the filter fits in the corners), high stability and large filtration volume. In addition, this solid base filter offers you special advantages such as a complete hose adapter with integrated shut-off valves, individually removable filter baskets with retractable handles, very low energy consumption, particularly quiet operation thanks to ceramic components and much more. External filter eXperience 250 with 3x filter mass and EHEIM SUBSTRAT