Far-infrared bacteria house main raw material is tourmaline, it will be electrified by electrostatic effect, because of its unique chemical properties, it can radiate far infrared, stimulate the negative oxygen ions, to promote the metabolism of fish, kill harmful bacteria, improve the oxygen capacity.This filter also contains kaolinite, can supplement rich minerals and trace elements.Under certain conditions, these substances will decompose slowly and be absorbed by fish.Far infrared bacteria house with porous structure, to promote the proliferate of beneficial bacterium, its huge specific surface area make it have stronger ability of ecological filter processing. Material: Kaolinite and Tourmaline Production:1300℃ high-temperature calcination Construction Features It contains micro-elements like kalium,calcium,magnesium and etc. 60-300um interior diameter is designed for a better growth and reproduction of microbes. It has wider specific surface(5~10 times wider than other filters ) and highly permeable pore structure. Glass Ceramic Ring,a wide-used filter product,works as a “cleaner” in the water ecosystem.It has outstanding characteristics in relation to the water quality and water flow. Usage: 1. Please clean the filter by water before filling materials in the filter groove. Different filter materials can be placed as single layer or mixed together. 2. 1L bio-chemical filtering materials can be used for 60L(60kg) water. Filtering effect is related to the using time, density of fishes and aquatic plants, water quality and size of stream.