Clarifies the water and eliminates nitrites, nitrates and ammonia. This product is a mixture of a highly performing special coal and zeolite. The coal used is virgin and of vegetable origin main component gusci di noce di cocco activated with a gas oven and mechanically worked. The more granules are small, the more coal is performing the optimum is 3 to 5mm. This type of coal is compact enough to allow an excellent filtration through the micro pores of its structure. The special zeolite used is the mixture of several types treated thermally, shredded in granules from 3 to 5mm and composed of various different minerals that combine to break down, in a single use, nitrite, nitrate, ammonia, phosphate, silicate and copper that are added to the peculiarities of coal. Notoriously, coal is not able to eliminate these harmful elements for the aquarium, which are often present due to the organic substances released by fish and plants. In marine aquarists, thanks to its ability to clarify the water in a relevant way, allows the corals to absorb more light.