These biological balls can be used to cultivate nitrifying bacteria in the water for resolving the feces and residue feed, so as to remove chlorine in the water and then prevent algae developing. Provide good water quality and a clean environment for your lovely fishes, tortoise, etc.    Features: Made from hollow polyester fibre, good breathability and hydroscopicity. Used to cultivate nitrifying bacteria and resolve the feces and residue feed. Improve water quality and strengthen fish immunity. Suitable for any breeding environment, such as sea water, fresh water, fish-farming, water plants, etc. Usage and Dosage: When cultivate nitrifying bacteria in the new water for the first time, each arrier can process 20-30L of water. You can put in into water separately or with mesh bag into the filter. The old hydroponic bacteria, each carrier can process 10L of water, combining use with other carriers may appropriately reduce the dosage. It need to be cleaned with water when there are too much dirt for repeated use; after washed, need to add fine nitrifying bacteria. Specifications: Color: White Material: Hollow Polyester Fibre Quantity: 20pcs Ball Dia.: Approx. 4.5cm Package Size: 20.5 * 16 * 4cm Package Weight: 130g / 4.58oz Package List: 20 * Aquarium Biological Balls
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