Natural Humin contains highly pure humic substances produced for aquaristics. Natural Humin binds pollutants, especially heavy metals in the water. The light tanning effect offers optimal slime protection. Spawn fungus is prevented. The healing process of lesions and wounds is supported. Natural Humic inhibits the growth of parasites, algae and fungi, reduces infection pressure. Natural humic acids provide yellow/brown colouring. A black water effect is created. Natural Humin is pH-neutral. Natural Humin was developed and optimised for fish from blackwater biotopes.