The Rock Booster with Bacteria and Filter Media Blocks is a high-performance solution designed to enhance filtration in saltwater reef aquariums. These blocks are made from a durable ceramic compound that provides an immense surface area for beneficial bacteria to colonize, effectively reducing phosphates, nitrates, and other harmful compounds. Each block supports up to 350 gallons of tank size, making the kit included in this product suitable for larger setups or tanks with higher bio loads. They are easy to install, requiring only a rinse before placement within your aquarium setup.