Rena Nexx is a modular filter designed to grow with your needs. For aquariums from 200 litres to 600 litres this external filter capacity and flow grows with each extension added. The Rena Nexx allows you to add extensions to the filter - increasing its capabilities even more. The filter will give you crystal clear water quality by using the Size 4 Bio-Chem Zorb cartridge. The API Crystal is easy and efficient. It removes colours and odours and 100% of the water flows through the cartridge. Don\'t want to use the API pouches? The holders simply un-click leaving you space to add media of your choice. The filter gives you the ultimate convenience with 4 minute or less media changes, no mess and filtration options give you the filtration and flexibility you want. The API Nexx Canister Filter is suitable for aquariums up to 55 gallons (200 Litres). When combined with the API Nexx Filter Extension, the Nexx Canister can filter aquariums up to 110 gallons (600 Litres). No priming Quick and easy 3 steps to media replacement in 4 minutes or less Flexible filtration options Superior water quality with the proven results of Bio-Chem Zorb Size 4 cartridge Comes complete with: - Nexx External Cannister - Low wattage adjustable pump - 2 x 1.8m length of hose - API Crystal Pouches - API Bacti Stars - Shepherds Crook Elbow Fitting - Directional outlet