Features: 1.HIGH PERMEABILITY: The porous cover of the ceramic filter ring after high temperature sintering effectively accelerates the establishment and regeneration of the nitrification system, and has a highly permeable capillary pore structure. 2.AEROBIC AND ANAEROBIC: Aquarium bio balls provide aerobic and anaerobic space, active aerobic and anaerobic bacteric populations, and effectively control the accumulation of nitrite and nitrate. 3.IMPROVE WATER QUALITY: Aquarium ceramic filter ring promotes the growth of biological colonies and maintains a large number of bacteric flora, which is beneficial to the water quality of the fish tank. 4.MULTIPLE USAGE SCENARIOS: Ceramic ring fish filter can be used in both freshwater and saltwater and fits most fish tanks and aquariums. This fish tank filter media can give your lovely fish a comfortable living environment. 5.BEST CHOICE: Aquarium ceramic filter ring has a super adsorption capacity, which can effectively absorb the odor in the fish tank and greatly improve the effect of the filter system. Our ceramic filter ring can be the best choice for you. Specification: Item Type: Ceramic Filter Ring Product Material: Technology Ring Uses: Aquarium, Fish Tank Filtration There is 0 5g Error. PackageList: 1 Bag x Technology Ring Note There is 0 5g error. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.