Feature: 1. It does not drop slag or muddy water. It is fired at high temperature, hard and firm, and will not powder when placed in water for a long time. 2. Rich in minerals and trace elements, it induces fish to increase its color. Suitable for filtration of fish tanks and aquariums. 3. The primary color sphere can degrade ammonia and nitrous acid, and maintain water quality. 4. Blue anionic nanospheres can enhance water permeability and enhance fish immunity. 5. Yellow energy nanospheres release trace elements and improve physical resistance. 6. The red nanospheres can cultivate nitrifying bacteria and keep the pH value of the fish tank stable. 7. Black far‑infrared nanospheres remove odors and activate water quality. Specification: Item Type: Filter Balls Material: Nanosphere Product Size: Ball Diameter: Approx. 3cm / 1.2in Weight: Approx. 526g / 18.6oz Suitable For: Filtration of Fish Tanks and Aquariums.. Package List: 1 Bag x Nanosphere Note: 1. When used to replace the original filter material in the tank, do not change it all at once! It is recommended to replace one‑fifth of the amount every 10 days, and close the fish tank cycle before taking out the original filter material to minimize water quality fluctuations.2. Regardless of whether it is a new tank or an old tank, as long as there are organisms in the tank, remember not to add too much at a time when adding any brand of any type of microbial‑cultivating filter material, because the organisms may not be able to withstand fluctuations in water quality.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.