“Rock Filter” tm 75 gallons on up. The Only AMERICAN MADE Aquarium Filter!!! this includes vats and tubs “Rock Filter” tm Rocket Filter tm (patent pending) This filter is a new design from the common box/corner filter that will out perform any sponge filter. It actually pulls from the bottom allowing better circulation of aquarium water and it keeps the bottom of the aquarium extremely clean. The water proceeds through small pea size lava rock then into the clear acrylic chamber were polyester filter fiber removes the finest particulate matter. This filter comes with the media and is ready to use. The “Rocket Filter” tm is great in Discus and Angelfish set ups – replacing the sponge filter. Not only will the “Rocket Filter” tm make your aquarium crystal clear but it is a very good nitrifying filter and you will be able to tell when it needs to be clean by the color change on the fiber material. – No ammonia spikes as you have with sponge filters and will not slime up as sponge filters do. Shipping in the continental USA is $28.00. Each filter comes (is packed) with lava rock or pea gravel and floss. The one pictured is for 75 gallon aquariums on up. Will ship world wide supply me with your city country and city/country code and I will give you shipping costs.