Free delivery from £39 (T&C’s apply)**
Contact us
Re-order
Basket
Tetra Filter Active - 250ml
Tetra FilterActive Bacteria: Comparison of old and new bottle design, same proven quality. Text: New Design, Proven Quality.
Tetra FilterActive Bacteria: Keeps the filter biologically active and reduces sludge, as well as harmful substances.
Special starter and cleaning bacteria for a stable aquarium system. Starter bacteria colonise the filter, while cleaning bacteria break down organic waste such as fish remains.
Suitable for freshwater aquariums, adds essential bacteria with every water change or filter cleaning, natural effect extends cleaning intervals and improves filter performance.
Dosage: 5 ml per 20 litres of aquarium water. Shake well before use, add after water or filter changes. Use half the dosage for partial water changes. Apply after filter changes.
Tetra AquaSafe makes tap water fish-friendly and protects fish as well as plants from harmful substances. The ideal addition for safe water.
Quality promise: IFS Food certified production, all food and care products manufactured in Germany, complete use of renewable energy.
Everything for aquatics. Discover the world of Tetra products: food, care, aquariums, and accessories.
Tetra FilterActive contains live cleaning bacteria. Contents: 250 ml for 1,000 L aquarium water. Dosage instructions on the label. Best before date and batch number on the bottom.
1/10
Tetra Filter Active - 250ml
Tetra FilterActive Bacteria: Comparison of old and new bottle design, same proven quality. Text: New Design, Proven Quality.
Tetra FilterActive Bacteria: Keeps the filter biologically active and reduces sludge, as well as harmful substances.
Special starter and cleaning bacteria for a stable aquarium system. Starter bacteria colonise the filter, while cleaning bacteria break down organic waste such as fish remains.
Suitable for freshwater aquariums, adds essential bacteria with every water change or filter cleaning, natural effect extends cleaning intervals and improves filter performance.
Dosage: 5 ml per 20 litres of aquarium water. Shake well before use, add after water or filter changes. Use half the dosage for partial water changes. Apply after filter changes.
Tetra AquaSafe makes tap water fish-friendly and protects fish as well as plants from harmful substances. The ideal addition for safe water.
Quality promise: IFS Food certified production, all food and care products manufactured in Germany, complete use of renewable energy.
Everything for aquatics. Discover the world of Tetra products: food, care, aquariums, and accessories.
Tetra FilterActive contains live cleaning bacteria. Contents: 250 ml for 1,000 L aquarium water. Dosage instructions on the label. Best before date and batch number on the bottom.
new

Tetra Filter Active

250ml
Write your review
new
  • Aquarium care with live bacteria
  • Accelerates pollutant breakdown
  • Reduces filter sludge, organic contamination
  • 100% biological
  • For all freshwater aquariums
  • Easy to use
...further information
new

Tetra Filter Active

250ml
Write your review
new
  • Aquarium care with live bacteria
  • Accelerates pollutant breakdown
  • Reduces filter sludge, organic contamination
  • 100% biological
  • For all freshwater aquariums
  • Easy to use
...further information
Tetra Filter Active - 250ml
Tetra FilterActive Bacteria: Comparison of old and new bottle design, same proven quality. Text: New Design, Proven Quality.
Tetra FilterActive Bacteria: Keeps the filter biologically active and reduces sludge, as well as harmful substances.
Special starter and cleaning bacteria for a stable aquarium system. Starter bacteria colonise the filter, while cleaning bacteria break down organic waste such as fish remains.
Suitable for freshwater aquariums, adds essential bacteria with every water change or filter cleaning, natural effect extends cleaning intervals and improves filter performance.
Dosage: 5 ml per 20 litres of aquarium water. Shake well before use, add after water or filter changes. Use half the dosage for partial water changes. Apply after filter changes.
Tetra AquaSafe makes tap water fish-friendly and protects fish as well as plants from harmful substances. The ideal addition for safe water.
Quality promise: IFS Food certified production, all food and care products manufactured in Germany, complete use of renewable energy.
Everything for aquatics. Discover the world of Tetra products: food, care, aquariums, and accessories.
Tetra FilterActive contains live cleaning bacteria. Contents: 250 ml for 1,000 L aquarium water. Dosage instructions on the label. Best before date and batch number on the bottom.
Tetra Filter Active - 250ml
Tetra FilterActive Bacteria: Comparison of old and new bottle design, same proven quality. Text: New Design, Proven Quality.
Tetra FilterActive Bacteria: Keeps the filter biologically active and reduces sludge, as well as harmful substances.
Special starter and cleaning bacteria for a stable aquarium system. Starter bacteria colonise the filter, while cleaning bacteria break down organic waste such as fish remains.
Suitable for freshwater aquariums, adds essential bacteria with every water change or filter cleaning, natural effect extends cleaning intervals and improves filter performance.
Dosage: 5 ml per 20 litres of aquarium water. Shake well before use, add after water or filter changes. Use half the dosage for partial water changes. Apply after filter changes.
Tetra AquaSafe makes tap water fish-friendly and protects fish as well as plants from harmful substances. The ideal addition for safe water.
Quality promise: IFS Food certified production, all food and care products manufactured in Germany, complete use of renewable energy.
Everything for aquatics. Discover the world of Tetra products: food, care, aquariums, and accessories.
Tetra FilterActive contains live cleaning bacteria. Contents: 250 ml for 1,000 L aquarium water. Dosage instructions on the label. Best before date and batch number on the bottom.
Choose item (2 options)
€9.19
€36.76 / l

Earn 9 zooPoints on this product

Delivery in 3-6 working days more
Return Policy more
All prices include statutory VAT. Additional shipping costs may apply.

Product description

  • Aquarium care with live bacteria
  • Accelerates pollutant breakdown
  • Reduces filter sludge, organic contamination
  • 100% biological
  • For all freshwater aquariums
  • Easy to use
Natural biological support for your aquarium – Tetra Filter Active provides essential bacteria with every water change or filter cleaning, complementing and supporting the aquatic ecosystem. The liquid recipe contains a special combination of live starter bacteria and sludge-degrading cleaning bacteria that work perfectly together. The starter bacteria quickly settle in the filter material and help restore and stabilise the biological balance. These nitrifying bacteria are crucial for the breakdown of ammonia and nitrite, thereby protecting your fish from harmful substances.

At the same time, the cleaning bacteria in Tetra Filter Active decompose organic waste such as fish excrement, food residues, accumulated sludge and dead plant matter. This natural activity keeps the filter clean for longer, significantly improves its performance and extends cleaning intervals. Furthermore, Tetra Filter Active promotes bioactivity in the substrate and prevents rot – creating a balanced, self-sustaining biological system for fish, plants and invertebrates.

Tetra Filter Active at a glance:
 
  • Biological aquarium care for all freshwater aquariums
  • Live starter bacteria: quickly settle in the filter
  • Sludge-degrading cleaning bacteria: decompose organic waste
  • Accelerates pollutant breakdown: ammonia and nitrite
  • Improves filter performance: significantly more efficient filter
  • Extends cleaning intervals: less maintenance required
  • Reduces filter sludge: fewer organic contaminants such as fish excrement and food residues
  • Prevents rot in the substrate: promotes bioactivity
  • 100% biological: does not cloud the water
  • Easy to use: 5ml per 20 litres after filter cleaning
  • Versatile application: for water changes, new fish or high fish density



Manufacturer Information

Tetra GmbH
Herrenteich 78, 49324, Melle, DE
service@tetra.net

Feeding guide

Application:
Shake well before use. After a water change or filter cleaning, add 5ml per 20 litres of aquarium water. After partial water changes, use half the dosage. 

An overdose is harmless, but may cause temporary water cloudiness due to bacterial blooms. In this case, ensure sufficient oxygen supply.