An overall compelling idea The ball-shaped pumphead can be rotated all the way around and is seated in a ball joint. The filtered water can therefore be directed in any direction. The control knob on the outflow nozzle allows you to adjust the pump output and throughflow. To control the aquarium's oxygen enrichment and air intake, the power diffuser is adjusted. (See accessories for other extension pieces that can be used in place of the diffusor.) A mediabox is located directly beneath the pumphead. EHEIM AKTIV can be used for adsorptive filtration, bioMECH or SUBSTRATpro for biological filtration, a fine filter pad for fine filtration/polishing, or a filter pad for mechanical-biological filtration. Additionally, biological and adsorbent filter pads or cartridges