Means Biotrace - is a carbon source for freshwater aquariums. It also adds tothe bacteria Biodigest the micronutrients necessary for the life of the aquariumand optimal cleaning activity (oligoelements, amino acids, vitamins, plant-basedsurfactants). Means Biotrace enhances the action of bacteria accelerates thedigestion of organic matter and thus improves water quality. It also helps toremove nitrates and phosphates, elements preceding the appearance of fibrousalgae and cyanobacteria.Dosage: 1 Biotrace ampoule per volume of water up to 200 liters every 15 days.One box is designed for a water volume of 1200 liters.