The EHEIM professionel 4 offers several functional advantages and the best choice for large aquariums - in the well-known EHEIM quality.The EHEIM professionel 4 is aimed specifically at aquarium enthusiasts who wants to filter larger aquariums in a tried and tested, conventional way. In this size range, a good combination of powerful filter performance, large volume and reliable technology is essential - and this is precisely where this external filter shows its strengths. The generous capacity of the filter ensures stable water parameters even with a high fish population and remains pleasantly quiet thanks to the precise ceramic bearings.Equipped with adapter, suction aid and filter inserts, installation is just as easy as subsequent maintenance:An easily accessible pre-filter under the pump head allows coarse dirt to be removed without having to reach into the sensitive bio-filter material. Its high-quality workmanship ‘Made in Germany’, technology and 3-year guarantee leave nothing to be desired.There are two filter versions available, including a thermofilter (600T) with integrated heater, developed for aquariums ranging from 300 to 800 litres,Advantages of the EHEIM professionel 4 ·         High-end technology for the most demanding criteria ·         Square basic shape for large filter volume and high stability ·         High flow rate with very low energy consumption ·         Large pre-filter easily accessible (directly under the pump head) for quick removal of mechanical contamination without having to disturb the sensitive bio-filter material ·         Large canister and filter volume ·         The filter canister fills quickly due to the integrated suction aid ·         High-quality wear-free ceramic axle and bearings guarantee quiet performance ·         Safety hose adapter with easy-to-operate locking device; the adapter can only be released when the hose valves are closed ·         Large safety closure clips for a tight and safe connection between the pump head and filter canister ·         Comes with installation accessories ·         Suitable for fresh and marine water (except thermofilter – for freshwater only) ·         Made in Germany ·         3 years warranty