The Fluval 1 Plus Underwater Filter is an optimal water filtration system with large filter volume and effective flow control. The double filter cartridge area allows alternate replacement for continuous biological filter activity and there is an additional area for optional media such as polyester filter pads or carbon filter pads. The Fluval 1 Plus Underwater Filter offers an air flow control device and water flow adjuster. The 90 degree swivel spout directs flow output and allows changes to the flow pattern in the aquarium.

The Fluval 1 Plus Underwater Filter is suitable for aquariums up to 12 U.S. Gal. (45 L).