10 Best Pond Filter Bacteria in The UK

Last updated on 24/06/2025

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Evolution Aqua Pure Filter Start Gel Pond Filter Starter Bacteria - Wildlife and Fish Friendly Water Pond Bacteria Treatment for Filters and Filter Media | 2.5L

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Why We Love It

Optimal start for new filters.
Fast acting, efficient gel formula.
Improves fish and plant health.

Main Highlights

✔ The perfect start for new pond filters - Delivers a concentrated formula of live beneficial bacteria and enzymes directly to your filters. Speeds up the maturation of your filter media giving your pond and fish the very best start.
✔ Fast acting gel formula is more efficient than liquid or tablet based products - The specialised gel based formula sticks directly to filter media and is the most optimal and quickest way to mature your filter media.
✔ Wildlife and fish friendly gel that increases the performance of your filter media - PURE+ Filter Start Gel is a naturally active pond water treatment that contains billions of filter bacteria that are 100% safe for all fish, plants and wildlife.
✔ Helps to break down harmful ammonia and nitrite resulting in happier and less stressed fish - 2.5 litre is designed to optimally treat 25000 litres of pond water and you cannot overdose with PURE+ Filter Start Gel.
✔ Multiple award winning product manufactured in the UK - Practical Fishkeeping product of the year and Aqua trade product winner. Part of the Evolution Aqua award winning range of bacterial products for ponds, freshwater and marine aquariums.

Bactoplus Fresh PSB Living Bacteria Water Treatment Koi Health Fish Pond Filter Liquid Remove Ammonia 2L

Why We Love It

Absorbs large organic waste quantities.
Enhances Koi fish colour vibrancy.
Promotes healthier aquatic environment.

Main Highlights

Absorbs large quantities of organic waste, reducing ammonia.
Creates healthier environment for fish and enhances Koi colour.
100% biological treatment, no colourants or preservatives.
Works with light, able to be used in larger quantities.
10ml per 1000 litres of water over 5 days.

Evolution Aqua Pure Filter Start Gel Pond Filter Starter Bacteria - Wildlife and Fish Friendly Water Pond Bacteria Treatment for Filters and Filter Media | 1L

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Why We Love It

Boosts filter media maturation.
Quick, efficient gel formula.
Promotes healthier, happier fish.

Main Highlights

✔ The perfect start for new pond filters - Delivers a concentrated formula of live beneficial bacteria and enzymes directly to your filters. Speeds up the maturation of your filter media giving your pond and fish the very best start.
✔ Fast acting gel formula is more efficient than liquid or tablet based products - The specialised gel based formula sticks directly to filter media and is the most optimal and quickest way to mature your filter media.
✔ Wildlife and fish friendly gel that increases the performance of your filter media - PURE+ Filter Start Gel is a naturally active pond water treatment that contains billions of filter bacteria that are 100% safe for all fish, plants and wildlife.
✔ Helps to break down harmful ammonia and nitrite resulting in happier and less stressed fish - 2.5 litre is designed to optimally treat 25000 litres of pond water and you cannot overdose with PURE+ Filter Start Gel.
✔ Multiple award winning product manufactured in the UK - Practical Fishkeeping product of the year and Aqua trade product winner. Part of the Evolution Aqua award winning range of bacterial products for ponds, freshwater and marine aquariums.

NT Labs Pond Mature, Pond Live Filter Bacteria, Breaks Down Toxic Fish Waste, Prevents Ammonia & Nitrite, Use After Adding New Fish or Cleaning Pond Filter

Why We Love It

Packed with beneficial bacteria.
Kick-starts your filter.
Versatile and easy use.

Main Highlights

【 PACKED WITH BENEFICIAL FILTER BACTERIA 】: Live Filter Bacteria (Mature) includes 7 key species of beneficial bacteria including Nitrosomonas spp., Nitrobacter spp., and Nitrospira spp. These bacteria will help effective biological filtration.
【 KICK-START YOUR FILTER 】: Add Mature to your new pond/filter to help ‘kick-start’ the filter. These friendly filter bacteria break down fish waste, making the water safe for your fish.
【 VERSATILE APPLICATION 】: Alternatively, you can use Mature when adding new fish, after a filter or water change, or following the use of a disease treatment.
【EASY TO USE】: To work out the required dosage for your pond, simply calculate the volume of your pond in litres (length x width x depth (in cm)/1000) or alternatively, use our Online Dosage Calculator. Shake bottle well. Use double dose at start of season or when establishing a new pond/filter. Add the required dose directly into the filter, if present.
【 EFFECTIVE FORMULA 】: Can be used weekly to control spikes in ammonia and nitrite. Use NT Labs Test Kits to monitor water quality.

NT Labs Koi Care Filter Bugs, Filter Bacteria Formulated for Koi, Contains a Blend of Nitrosomonas, Nitrobacter, Nitrospira and Supporting Bacterial Cultures. (1 Ltr)

Why We Love It

Promotes stable, quality water.
Essential for pond maintenance.
Easy to use.

Main Highlights

【BACTERIA RICH LIQUID FORMULATION】: Filter Bugs is an easy-to use liquid formulation, containing a blend of Nitrosomonas, Nitrobacter, Nitrospira and supporting bacterial cultures. These bacteria will repopulate your filter with nitrifying organisms to ensure efficient biological filtration and perfect, stable water quality.
【POND FILTER BACTERIA】: Use Filter Bugs when establishing a new filter, at the beginning of the pond season in spring, or when ammonia or nitrite levels are elevated.
【ESSENTIAL FOR REGULAR POND MAINTENANCE】: Filter Bugs should be added immediately after a substantial water change or pond clean, at the beginning of the pond season, after using a medicinal treatment or adding new fish, and whenever there is a detectable concentration of ammonia or nitrite in the water. Filter Bugs can be added once per week, or more often if desired.
【EASY TO USE】: To work out the required dosage for your pond, simply calculate the volume of your pond in litres (length x width x depth (in cm)/1000) or alternatively, use our Online Dosage Calculator. Measure out the required amount of Filter Bugs and add directly to the biological media within the filter. Switch off UV filtration for at least 24 hours after adding Filter Bugs to allow the nitrifying bacteria to colonise the filter and the pond.
【USE WITH NT LABS HEALTH PROMOTING SALT】: Filter Bugs can be used when Pond Salt Plus is present in the water at ‘General Tonic’ and ‘Anti-stress’ levels.

2 X Evolution Aqua Pure Pond Bomb

10% OffFree Shipping

Why We Love It

Free delivery in UK.
Effective pond treatment solution.
Aquarium-safe and user-friendly.

Main Highlights

Fast acting crystal water treatment
Breaks down ammonia and nitrite quickly
Cleans up organic waste
Helps to improve water clarity
2x Single use ball shaped bomb. Can be used on ponds and water features

Evolution Aqua Pure Pond – Beneficial Bacteria for Ponds | Pond Bacteria Treatment & Healthy Water Maintenance for clear pond | Aids biological filtration and Fish Safe Pond Equaliser | 500ml

4% OffFree Shipping

Why We Love It

Promotes healthy aquatic environments.
Efficiently reduces harmful components.
Simplifies water purification process.

Main Highlights

[EASY DOSAGE] – Similarly to Evolution Aqua Pure Pond Bomb simply add Pure Pond directly into your pond filter for optimal results, it can also go in the Pond but for the best results place in filter. Works with pond sludge treatment, pond algae treatment, sludge bomb or a pond green water treatment, Pure Pond balls provide a long-lasting and eco-friendly solution compatible with our full range of products.
[MAINTENANCE] – Achieve consistent crystal-clear water and a healthy aquatic environment by eliminating ammonia and nitrite, ensuring balanced water parameters for your precious fish and pond wildlife.
[BIODEGRADABLE DESIGN] - Pure Pond features biodegradable polymer balls that gradually release live pond bacteria as needed, providing a safe and natural pond water treatment solution for maintaining water quality without harming fish or aquatic life.
[LASTING BACTERIA BOOST] - Each litre of Pure Pond contains over 8 billion live bacteria, breaking down waste and supporting long-term pond health. Unlike Pond Bomb being for emergencies, this is a maintenance product so should be dosed monthly to provide your pond with consistently safe parameters
[IMPROVES FISH HEALTH] - By reducing harmful ammonia and nitrite levels, Pure Pond promotes a cleaner, healthier pond environment ensuring safe water parameters for your fish and reducing the risk of disease and nasty infections. It’s perfect supporting the ecosystem and the rest of the wildlife and animals surrounding your pond.

Envii Filter Feed – Pond Filter Starter Bacteria Treatment, Boosts Beneficial Bacteria Activity, Safe for All Fish & Wildlife – Treats 20,000 Litres

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Why We Love It

Enhances filter functionality with bacteria.
Effectively breaks down harmful compounds.
Ensures safety for all wildlife.

Main Highlights

Replenishes Beneficial Bacteria – Filter Feed contains billions of beneficial bacteria which helps with new & active filters. Provides bacteria instantly giving your filters, fish and pond a head start
Breaks Down Sludge, Ammonia & Nitrites – Our bacteria booster will help break down and digest all organic matter in filters whilst also reducing ammonia and nitrites. This reduces the amount you need to clean your filters
Safe for All Fish & Wildlife – Containing only natural ingredients, Filter Feed is safe for all fish, wildlife and plants.
Easy Application – Simply add 1 tablet directly into your filter. 4 tablets in one packet, each one treats 5,000 litres. No need to mix or dilute beforehand.
Envii Pond Products – Filter Feed can be used in conjunction with all our other pond products.

Blagdon Water Quality Pond Grenade, Safe, Natural, Fast Acting Beneficial Bacteria & Enzymes for Clean Pond Water, Pack of 3

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Why We Love It

Promotes clean, healthy pond environment.
Fast acting and safe formula.
Effortless usage for all ponds.

Main Highlights

FOR A CLEAN AND HEALTHY POND - Boosts removal of organic waste, ammonia and nitrite
FAST ACTING - Formulated using safe, fast acting, pure bacteria and enzymes
FOR USE WHEN - Starting a new pond, reactivating filter bacteria in Spring, introducing new fish, conducting pond maintenance
PET AND WILDLIFE SAFE - Harmless to filters and all species of pond fish, plants, pets and wildlife
EASY TO USE - Pack of 3 Pond Grenades, each Grenade treats 5,000 litres of pond water

Evolution Aqua Pure Pond Bomb – for Crystal Clear Healthy Water, Treats up to 20,000 litres

7% OffFree Shipping

Why We Love It

Natural, fast-acting pond solution.
Safe for all ponds.
Award-winning UK product.

Main Highlights

✔ NATURAL, CHEMICAL FREE SOLUTION FOR CRYSTAL CLEAR, HEALTHY POND WATER – Pure Pond Bomb contains beneficial bacteria and natural enzymes that rapidly break down organic waste leaving your pond clean and fish healthy.
✔ FAST ACTING, INTENSIVE TREATMENT FOR YOUR POND – For use in water quality emergencies or when making any changes to your pond system, such as adding new fish or changing diet.
✔ SAFE FOR FISH AND ALL PONDS – Pure Pond Bomb’s all natural ingredients only activate when needed. Safe to use in new or established, filtered or non-filtered, self-contained water features and ponds.
✔ PLANT AND POND LIFE FRIENDLY – Pure Pond Bomb does not contain any algaecides which can be harmful to fish, plant and pond life. It is not intended to clear green water. Use Pure Pond Bomb together with an appropriate UV Clarification to safely eradicate green water.
✔ AWARD WINNING PRODUCT, MANUFACTURED IN THE UK – Voted product of the year by Practical Fishkeeping and AQUA.

8.8

Excellent

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We scanned 1834 products

We reviewed these offers relevant to the Pond Filter Bacteria within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Evolution Aqua, Superfish, NT Labs, envii, Blagdon, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best Pond Filter Bacteria in the market, we considered we took a deep dive into 9171 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Evolution Aqua Pure Filter Start Gel Pond Filter Starter Bacteria - Wildlife and Fish Friendly Water Pond Bacteria Treatment for Filters and Filter Media | 2.5L. We love many things about this product by Evolution Aqua. What sets it apart from the competition is Optimal start for new filters, Fast acting, efficient gel formula, Improves fish and plant health.
The best value product for most shoppers and where user satisfaction is continuously the highest is Bactoplus Fresh PSB Living Bacteria Water Treatment Koi Health Fish Pond Filter Liquid Remove Ammonia 2L by Superfish based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for Pond Filter Bacteria and the best cost-to-value ratio is 2 X Evolution Aqua Pure Pond Bombat Evolution Aqua with a 10% discount.
Our list of the best Pond Filter Bacteria is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.

10 Best Pond Filter Bacteria in The UK

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We scanned 1834 products

We concluded that: