9-in-1 aquarium filter media: It is composed of 9 selected materials rich in minerals and trace elements. Without rocks, you will get more high-quality biological media. To help you improve and stabilize water quality. Improve water quality microcirculation, enhance metabolism and increase fish energy. The ceramic biofilter material is fired at high temperature: The surface and the inside of the biological medium are full of small holes, It provides an environment for the growth and reproduction of nitrification. A perfect nitrification system can effectively improve water quality. The perfect aquarium biological filter media: The ceramic biological medium obtains the best water quality through the best biological purification of fresh water and sea water. It is an enhanced filter material with pure biological properties. This aquarium biological filter material can be cleaned and reused within 6 years. Scope of use: Can be used for all biological internal filters, external filters, sewage tanks, Marine and freshwater fish tanks, ponds, tank filters and hanging filters. About use: The biological filter material of the fish tank filter should be rinsed clean before use, and generally does not need to be cleaned after use. It can also be cleaned once every 6 months according to the use condition, (cleaning with the original water tank water is sufficient). Reminder: The following situations need to be replaced: 1. A large number of fragments appear after loosening 2. Use contaminated water 3. The effect is significantly reduced