DENNERLE FB7 Bi Active is a highly active concentrated mixture of selected living cleaning bacteria. They start to work degrading harmful substances immediately on entering the aquarium water. Efficient nitrifying bacteria remove dangerous ammonia & nitrin. Sludge-degrading bacteria reduce the organic sludge on the aquarium bed & in the filter with the aid of hydrolytic enzymes. Other types of bacteria bred specifically for aquaria feed on plant & food residues fish excrement & organic suspended matter. FB7 Bi Active boosts the self-cleaning capacities of all fresh water aquaria on a lasting basis. The optimized water conditions reduce stress. The fishes´ well-being is enhanced in a healthy environment. The water remains clearer. Breaks down fish excrement dead plant matter & food residues even in inaccessible areas Activates the aquarium´s biological self-cleaning capacity Removes toxic substances such as ammonia & nitrite Activates aquarium filters improves filter performance With bioactive sludge-degrading bacteria Bacteria play a decisive role in maintaining the biological balance in an aquarium. These invisible helpers continually remove fish excrement dead plant matter & food residues. Each type of bacteria is specialized in certain substances. This means that only the ´right´ bacteria guarantee swift & reliable degradation of the waste substances which typically occur in aquaria. A new aquarium or fresh filter material are virtually sterile. Without active assistance it may take many weeks for a stable bacterial fauna to develop. Substances which are toxic to fish such as ammonia & nitrate may accumulate & pose a danger to life in the aquarium. Only an extremely minimal level of bacteria is permissible in tap water for human consumption – which is why it is chlorinated by the waterworks. Aquarium fish need water which is ´alive´ however.