From tap water to aquarium water. No matter how hygienic and cleanour tap water may be it, is nowherenear being aquarium water. Manyimportant plant nutrients are missingin tap water or were extractedduring treatment. Carbon, potassium,sodium, iron, manganese aswell as many other trace elementsand numerous organic substancesthat are essential, for example, forhealthy plant growth. Chlorine,silicates, heavy metals and organicpollution can be the cause of manywater problems. Healthy and balancedbacterial conditions also have adecisive impact on the biology andwell-being of all inhabitants of theaquarium. The objective thereforeis to create optimum conditions forfish and plants.