Modern filters in various models. There are three models of the Eheim professional 4+ external filter for aquariums up to 250, 350, and 600 liters. The 250 and 350 models are also available with an integrated heater as a thermo filter (T). The 350e model additionally offers electronic control from a PC. The highlight is the new "Xtender": When the filter media becomes dirty and water flow decreases, you can easily adjust it using the rotary knob. This means you don't have to intervene immediately and gain a few days before the next cleaning of the filter media. Biological filtration is still maintained through redirected water flow. The professional 4+ appears in a modern anthracite gray and is delivered with color-matching hoses, pipes, etc.

Advantages of the Eheim professional 4+ filters:

• Top-class external filter with all the benefits of the professional 3 series for aquariums from 120 to 600 liters.
• Additionally equipped with a control function to extend the service life when filter media is dirty (Xtender).
• Square base shape for large filter volume and high stability.
• High flow rate with very low energy consumption.
• Pump performance is adjustable.
• Whisper-quiet operation and extremely long lifespan due to high-performance ceramic in the pump drive.
• Suction aid for quick filling of the filter system.
• Safety hose adapter; can only be disconnected when valves are closed.
• Large pre-filter retains coarse dirt and ensures a long service life of the biological filter material; easy to remove and clean.
• Individually removable, customizable filter baskets with "Easy Clean" cleaning grid.
• Fully equipped with original Eheim filter media and installation accessories.