Lee's Bio-Pin Balls are state-of-the-art biological filter media designed for superior performance in both freshwater and saltwater wet/dry filtration systems. These innovative balls are engineered to create optimal conditions for beneficial nitrifying bacteria, effectively breaking down harmful ammonia and nitrite. They significantly enhance the gas-exchange process within your filter, ensuring a healthier and more stable aquatic environment. Each small Bio-Pin Ball boasts 110 individual Bio-Pins, providing numerous drip points for maximum efficiency. With approximately 120 balls per gallon and an impressive 150 square feet of surface area per cubic foot of media, these balls offer extensive colonization space for bacteria. Their 1.40-inch outside diameter allows for versatile placement, whether connected together or randomly distributed within your filter box, promoting excellent water and gas movement. This bulk package of 3000 small Bio-Pin Balls, equivalent to 25 gallons or 3.33 cubic feet, is ideal for large-scale reef aquariums or multiple freshwater setups. For saltwater systems, a suggested usage of one gallon of Bio-Pin Balls per 20 gallons of tank water ensures robust biological filtration, making this an economical and high-performance choice for serious hobbyists, commercial facilities, or those setting up new, substantial filtration systems.