Lee's Quick & Easy Corner Filter is a mechanical filtration system that is complete and ready for installation in your aquarium. The system can be attached to airline and pump with the three suction cups for stability, while allowing maximum water circulation. The solid plastic window on the filter cover allows viewing for maintenance requirements that can be done in three easy steps. For aquariums up to 15 gallons. Includes Quick & Easy disposable cartridge and Slim Discard-A-Stone. Shipping weight: 1/2 lb.