Check the listing for details. FLUVAL BIO-FX - 5 L - A1459. Condition: New. Listed at 34.99 USD. FLUVAL BIO-FX - 5 L - A1459 BIO-FX is a premium biological media designed for use with canister filters and sumps of all sizes, including Fluval’s flagship FX series. Featuring a deep pore structure with interconnected micro-tunnels, BIO-FX offers a vast surface area where billions of beneficial nitrifying bacteria can thrive. FEATURES: Biological filter mediaSafe, Inert Ceramic MaterialDesigned for use with sump filtration and canister filters of all sizesDeep pore structure with interconnected micro-tunnels offers vast surface area for billions of beneficial nitrifying bacteria to establish and thriveLinked cavities permit free and even water flow, discourage blockages and prolong contact time for superior and effective biological filtrationAllows for the establishment of a high concentration of nitrifying bacteria to reduce ammonia and nitrite quickly and efficiently for a healthier aquariumFor best results, rinse monthly using aquarium water and replace partially every 6 monthsFor optimal filtration, place in the last stage of the filtration processUsage: For most aquariums, 1 filter basket layer of BIO-FX is adequate. For higher bio loads, additional BIO-FX can be used We will pick best available way to ship Thank you, CountryFishGirl