Aquarium Biomedia: Mix multiple biological filtration media: Each bag of 1.1 pounds/500 grams of filtration media comes with a zippered mesh bag. A perfect combination of various media, including ceramic rings, porous ceramic biospheres, biochemical balls, quartz beads, rice stones, and more. Ceramic media are fired at high temperatures, and their surfaces and interiors are filled with small pores, It provides an environment for the growth and reproduction of beneficial nitrifying organisms Forming a complete biological nitrification system can effectively improve water quality microcirculation, Enhance metabolism and increase fish energy. Maifan stone and volcanic stone contain various minerals and trace elements. Providing essential minerals for fish growth, activated carbon can purify water quality, Remove the odor from the fish tank water and make it clearer. Regarding use: Please rinse with water before use, please refer to the instructions on the back of the product for details. Reminder: Ceramic biological media will be upgraded and improved with market demand, and the variety types may change in the later stage. If you have any questions or suggestions, please contact us! We are honored to serve you!