Model Number:Nicoonexarphoi0gz Product Dimensions:23 x 15 x 6 cm; 710 Grams Item Weight:710 g Features: The bacteria culture ball can be used on both seawater and fresh water.It allows nitrifying bacteria that breaks down fish waste and uneaten food to breed successfully in less time. So, the more balls you use, the more effective the water purification will be.They provide a good place for the adhesion and reproduction of aquarium bacteria.The ball stabilizes the water without causing PH or GH changes.This balls are compact, reused, and durable for a long life of up to 2 years. Specification: Color: Pink Function: Culture of Aquarium Bacteria Diameter of Ball: Approx. 1 cm / 0.39inch Weight: 705g Type: Cleaning Tools Package List: 1 * Pack of Culture Ball Note: Only clean fish tank water or chlorine water. Since the there is powder in the balls, so please wash the balls before use. The bacteria culture ball can be used on both seawater and fresh water. It allows nitrifying bacteria that breaks down fish waste and uneaten food to breed successfully in less time. So, the more balls you use, the more effective the water purification will be. This balls are compact, reused, and durable for a long life of up to 2 years. The ball stabilizes the water without causing PH or GH changes. They provide a good place for the adhesion and reproduction of aquarium bacteria. The bacteria culture ball can be used on both seawater and fresh water. It allows nitrifying bacteria that breaks down fish waste and uneaten food to breed successfully in less time. So, the more balls you use, the more effective the water purification will be. This balls are compact, reused, and durable for a long life of up to 2 years. The ball stabilizes the water without causing PH or GH changes. They provide a good place for the adhesion and reproduction of aquarium bacteria.