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Undergravel filters offer the most economical and most efficient means of filtering the freshwater tank especially for the novice. 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.