Long-absorbing pellet carbon --- This extraordinarily effective activated carbon produced from vegetable carbon is subjected to strict quality controls. It is a product designed for the absorption of organic waste products, chlorinated compounds, for the reduction of chlorine and chlorinated compounds and for the complete removal of drug residues, improving the quality of the water in the aquarium. This pelleted carbon has a very advanced porosity and adsorption --- PH: neutral -- The package includes a sock for use in the sump or filter. Available packages: 500ml-1/5/10 lt Dosage = Freshwater: 100g per 100lt - Marine water: 150g per 100lt