With EHEIMclassic you have everything that makes up a good external filter. By choosinga classic you won't go wrong. Because you have chosen a reliable, millionfoldtried and tested piece of equipment. All models perform to the highest qualitystandards. First class components and carefully matched features ensure perfectpump and filter performance. Additionally, you have the proverbial EHEIM quietrunning, robust durability, and low energy consumption. You will be verysatisfied.There are 5 models for aquariums from 50 up to 1500 litres - with variousequipment.Benefits of EHEIM classic external filter: Millionfoldtried and tested Exceptionalvalue for money Very quietrunning Low energyconsumption Long-lastingflexible silicon sealing ring in pump head (for easy and safe replacement aftercleaning) Can befilled with filter pads and/or loose filter media Comes withspray bar, inlet pipe, hose and installation accessories Versatileaccessories 5 models:50-150, 80-250, 120-350, 180-600, 300-1500L. Reliablestandard in high qualityThe over decades and millionfold tried and tested external filter generationwith a sound range of basic features and very high standard of quality.Carefully matched components and features.The balance between pump performance and tank volume provide the bestconditions for your aquarium.Pleasantly quiet running, robust durability, long service life,low energy consumptionExcellent value for moneyAll models include spray bar, inlet pipe, hose and installation accessories Specific equipment of individual models: Classic 150 with base for safe positioningClassic 250 with filter basket, with 1 each of coarse filter pad, fine filterpad and activated carbon pad eachClassic 1500XL with practical drain tap; pump unit can be operated separatelyfrom the canisterThe filter can be operated with coarse and fine filter pads. However, werecommend a filter media layering set up using EHEIM filter media. For this,there are filter Media Sets for each model (except classic 150). A variety of accessories allow you to upgrade the features to meet yourrequirements.