Feature:1. Water purification bag belongs to physical adsorption, harmless to fish, and will not spit, can be used in the filter tank for a long time.2. Super strong adsorption function, the function is far more than activated carbon, is a kind of physical filtration material, clean water without any side effects.3. Purify water quality and absorb harmful substances, eliminate yellow water, effective within 24 hours.4. Removing ordor and extend the water change time.5. After washing with tap water before use, it can be placed in thefilter where the water can wash to. It can be changed when it becomes dark coffee color.Specification:Condition: 100% Brand NewItem Type: Fish Tank Water PurifierMaterial: Water Purifier Bag Color: As Pictures Shown Weight: Approx. 146gHow to Use: After washing with tap water before use, it can be placed in the filter where the water can wash to. It can be changed when it becomes dark coffee color..Package List:1x Water Purifier Bag