API FILSTAR FILTRATION FOAM is the ideal thickness to filter small waste particles in aquarium water. Serves as part of the mechanical filtration for API FILSTAR XP. Dual-density pad is effective for approximately one month of use. Use as directed on product label. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.