A treatment for freshwater aquariums containing: humic acids extracted from peat utilising a natural method which recreate tropical water conditions, mineral salts which compensate any lack of these important substances in osmotic water, trace elements to replenish the lack of these elements due to water evaporation or assimilation by aquatic plants in the aquarium. BIOTRIX BLACWATER is the prefect combination of vital elements for the aquarium and the best product to maintain a correct biological balance in the water.