Clear water filter bacteria - the little helpers that make a big difference

Bacto Elixier FB7


  • Active mixture of selected live filter bacteria
  • For fast biological filter activation
  • Breaks down fish excrement, food residues and dead plant matter
  • Breaks down proteins, fats, carbohydrates and many harmful organic substances
  • Removes toxic substances (ammonia, nitrite)

Bacteria play a decisive role in maintaining the biological balance in an aquarium.These invisible helpers continually remove fish excrement, dead plant matter and food residues. Each type of bacteria is specialised in certain substances. This means that only the "right" bacteria guarantee swift and 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 and nitrate may accumulate and 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.

Bacto Elixier FB7 BiActive ClearWater FIlteringBacteria

DENNERLE Bacto Elixier FB7 BiActive is a highly active, concentrated mixture of selected living cleaning bacteria.
They set to work degrading harmful substances immediately on entering the aquarium water.

Efficient nitrifying bacteria remove dangerous ammonia and nitrite. Sludge-degrading bacteria reduce the organic sludge on the aquarium bed and in the filter with the aid of hydrolytic enzymes. Other types of bacteria bred specifically for aquaria feed on plant and food residues, fish excrement and organic suspended matter. FB7 BiActive boosts the self-cleaning capacities of all fresh water aquaria on a lasting basis. The optimised water conditions reduce stress. The fishes' well-being is enhanced in a healthy environment. The water remains clearer.


• when introducing new fish
• when setting up new aquaria
• for reduced cleaning effort thanks to sludge degradation
• when setting up/cleaning the filter
• after treating with medication
• after every water change
• when ammonia or nitrite levels are high
• when the fish population is large
• when there are problems with water quality
• when there is a build up of sludge

Art. no.ContentsFor aquarium size (litres)
1679250 ml1.250 litres
1680500 ml2.500 litres
  • Dosage / application

    Normal dosage

    20 ml in 100 L of aquarium water, weekly – for example, after a partial water change or filter cleaning, to improve and stabilise the water quality

    For increased requirements

    40 ml in 100 L of aquarium water, weekly – for example, after treating with medication or for a large fish population

    For measurable ammonia or nitrite content:

    40 ml in 100 L of aquarium water, daily, until the ammonia/nitrite have fallen to 0 mg/L


    Shake bottle before use. Add product in an area with good water flow, e.g. near the filter return flow in the aquarium.