Cascade Koi & Aquatics have been selling and recommending Fluval products for many years.
Fluval BIOMAX bio rings have a complex pore system creating an optimal environment where beneficial bacteria can thrive. BIOMAX bio rings have more capacity than most biological filter media and allow ideal water movement throughout the media to ensure optimal contact time for efficient biological filtration. BIOMAX also reduces and controls ammonia and nitrate. For freshwater and marine environments. For filter models: 106, 206, 306, 406, FX4, FX5, FX6, 105, 205, 305, 405, 104, 204, 304, 404