Added strength of the Premiuim UGF plates makes this aquarium filter most preferred by saltwater aquarist.
This biological filter has a multi-level plate design. The larger plate sizes reduce the number of plates required. The molded gravel guards eliminate the possibility of gravel falling down the uplift tube. Includes Premium Carbon Cartridges, Slim Discard-A-Stones, telescoping ring for uplift tube height adjustment and Lee's fish-saver elbow. Made of special quality plastic which resists splitting and cracking. Hexagonal shapes are of single-plate design.
Undergravel filters clean and filter the water by pulling it down through the gravel, trapping contaminates in the gravel and leaving the water clear and healthful for fish. The gravel provides both the mechanical filtration needed to trap the large particulates of excess food and fish feces, and the surface area to cultivate biological activity for cleaning the water of dangerous biological by-products such as Ammonia.