The Genesis Rock Power Pack is a highly effective, 100% ceramic filter media designed to dramatically increase your aquarium's biological filtration power. Fired at over 600 degrees, these durable blocks provide an immense surface area of more than 46,000 square feet for beneficial bacteria to colonize, actively working to reduce nitrates, phosphates, and other dissolved organic compounds for cleaner, healthier water. This pack includes four 4" x 4" x 1" Genesis Rock blocks, each capable of supporting up to 350 gallons, providing a total coverage for aquariums up to 1,400 gallons. Featuring advanced zero leach technology, these ceramics ensure no unwanted substances are released into your tank, making them safe for both freshwater and saltwater environments. They can be discreetly placed under substrate, in refugiums, or within your main aquascape. This product is an essential upgrade for any aquarist seeking to significantly enhance their tank's nutrient export and overall water quality over many years. It is particularly beneficial for systems with high bioloads, such as predator tanks, which demand robust biological filtration to maintain stable parameters. The Genesis Rock Power Pack offers a long-term, low-maintenance solution for superior aquatic environments.