Aqua Source BIOFLO Filter Media

Aqua Source BIOFLO Filter Media

High-Surface-Area Biological Filter Media for Moving Bed Pond Filters, MBBR, IFAS and RAS Systems

Aqua Source BIOFLO Filter Media is a highly efficient biological filtration media designed to provide an exceptionally large protected surface area for beneficial bacteria and biofilm development. Manufactured from durable Virgin HDPE, BIOFLO is engineered to operate while suspended and moving freely in water, creating excellent conditions for biological activity within pond filters, Moving Bed Biological Reactors (MBBR), Recirculating Aquaculture Systems (RAS), and other biological water-treatment applications.

At the heart of BIOFLO’s performance is its specially designed internal structure. Each individual media element provides multiple protected surfaces where beneficial microorganisms can colonise and establish a healthy biofilm. Unlike open surfaces that may be exposed to excessive abrasion or cleaning action, these protected internal areas provide bacteria with a more stable environment in which to grow and remain active.

This makes BIOFLO particularly effective in moving bed filtration systems, where the media remains continuously or intermittently in motion as water and air move through the filter chamber. The movement encourages good contact between the pond water, dissolved oxygen, and the bacterial biofilm, supporting the biological processes responsible for processing dissolved waste within the water.

BIOFLO provides an impressive protected surface area of approximately 800m² per cubic metre, giving beneficial microorganisms a substantial amount of protected colonisation space within a relatively compact volume of filter media. The manufacturer also states a total surface area of approximately 1036m²/m³, demonstrating the large overall surface provided by the media’s engineered shape.

A high surface area is particularly valuable in biological filtration because it allows a larger bacterial population to develop within the available filter chamber. This can help maximise biological filtration capacity without requiring unnecessarily large quantities of traditional static media.

The innovative open design of BIOFLO also allows water to pass freely through and around each media element. Large openings help prevent the media from acting like a tightly packed mechanical filter and allow wastewater or pond water to circulate through the internal structure.

This continuous water movement helps expose the biofilm to nutrients and oxygen while encouraging the development of a healthy, relatively thin biological layer. Maintaining an active biofilm is an important part of efficient biological water treatment because it enables microorganisms to remain in contact with the water passing through the system.

For fish ponds, BIOFLO is particularly well suited to moving bed filters. In this type of filtration system, the media is normally held inside a chamber while aeration keeps the pieces moving. The constant motion helps mix the water and media, while oxygen supplied by the air system supports aerobic bacteria.

Beneficial bacteria growing on the media form part of the biological filtration process that helps convert waste compounds produced by fish, uneaten food, and decomposing organic material. This makes biological media an important component in maintaining a stable aquatic environment, particularly in ponds with significant fish populations.

The rugged construction of BIOFLO makes it suitable for continuous movement within appropriately designed biological filter chambers. Unlike soft or easily compressed filter materials, the individual HDPE elements are designed to retain their shape while circulating inside the reactor or filter.

Its compact dimensions of approximately 16.75mm × 5mm per piece allow a large number of media elements to be contained within the biological chamber. Together, these pieces create an extensive three-dimensional habitat for bacterial colonisation while still leaving substantial open space for water movement.

BIOFLO is not limited to domestic garden ponds. Its design also makes it suitable for larger Recirculating Aquaculture Systems (RAS), where biological filtration is an important part of continually treating and reusing water in fish-holding systems.

The media is also suitable for Moving Bed Biological Reactor (MBBR) applications used in larger-scale water treatment. In these systems, large quantities of moving biological carrier media provide a stable surface on which microorganisms can develop while the media circulates through the treatment chamber.

BIOFLO may additionally be used within Integrated Fixed Film Activated Sludge (IFAS) systems, where carrier media provides additional surface area for attached bacterial growth alongside other biological treatment processes.

The high protected surface area can increase the concentration of attached biomass available within a treatment vessel. In appropriate engineered wastewater systems, this can allow significant biological activity to take place within a comparatively compact reactor volume.

For pond keepers, however, the principle remains straightforward: more suitable protected surface area provides more space for beneficial bacteria to colonise. Combined with good water circulation and adequate oxygen, BIOFLO can become an effective biological stage within a properly designed pond-filtration system.

The open structure of the media is equally important. Water needs to circulate freely around the bacterial surfaces so that dissolved waste can reach the microorganisms responsible for biological treatment. The large openings in BIOFLO help maintain this circulation and prevent the internal surface from becoming unnecessarily isolated from the surrounding water.

When used in a moving bed chamber, suitable aeration should normally be provided to keep the media circulating and oxygenated according to the design of the filter. Correct movement helps prevent excessive accumulation of debris while encouraging active biofilm development.

New biological media does not become fully mature immediately after installation. Beneficial bacteria require time to colonise the available surfaces and develop into an established biofilm. The maturation period will depend on factors such as water temperature, oxygen availability, fish loading, water chemistry, existing filtration, and the biological condition of the system.

During this establishment period, water-quality parameters should continue to be monitored. BIOFLO provides the physical habitat required by the bacterial population, but successful biological filtration also depends on correct filter design, water movement, oxygen supply, stocking level, and routine system management.

The media is available in 25-litre and 50-litre quantities, allowing pond owners and filtration professionals to choose an appropriate volume for different filter chambers and system capacities. The correct amount required will depend on the design and operating requirements of the individual biological filter.

Whether used in a garden fish pond, koi filtration system, large holding tank, aquaculture facility, or professional wastewater-treatment installation, Aqua Source BIOFLO Filter Media provides a durable and highly efficient biological carrier with an exceptionally large surface area for microbial colonisation.

Key Features

• High-performance biological filter media
• Designed to support beneficial bacterial biofilm
• Excellent for moving bed biological filtration
• Approximately 800m²/m³ protected surface area
• Approximately 1036m²/m³ total surface area
• Large internal protected areas for bacterial colonisation
• Open structure encourages free water movement
• Helps maintain a healthy and relatively thin biofilm
• Designed to operate while suspended in water
• Durable and rugged construction
• Manufactured from Virgin HDPE
• Individual media dimensions approximately 16.75mm × 5mm
• Suitable for garden fish ponds
• Suitable for koi pond moving bed filters
• Suitable for Recirculating Aquaculture Systems
• Suitable for MBBR applications
• Suitable for IFAS systems
• Suitable for larger tanks and treatment systems
• Available in 25-litre and 50-litre quantities

Surface Area

BIOFLO provides two important surface-area figures:

Protected Surface Area: Approximately 800m²/m³

This represents the substantial internal surface that is protected within the structure of the media and provides favourable areas for biofilm development.

Total Surface Area: Approximately 1036m²/m³

This represents the overall surface area of the media, including both protected and more exposed surfaces.

The high protected surface area is particularly useful in moving bed biological filters because it provides a large habitat for microorganisms within a comparatively compact volume of media.

Why Protected Surface Area Matters

Biological filtration relies on microorganisms growing on available surfaces.

A well-designed biological carrier therefore needs to provide:

• Plenty of surface for bacterial colonisation
• Protected areas where biofilm can remain established
• Sufficient open space for water circulation
• Good contact between bacteria and dissolved waste
• Access to dissolved oxygen
• A structure capable of operating continuously in moving water

BIOFLO has been designed around these requirements, combining a large overall surface area with protected internal sections and substantial open channels.

What is a Moving Bed Filter?

A moving bed filter is a biological filter chamber containing floating or suspended biological media.

Air is normally introduced into the chamber to move the media continuously. This creates contact between:

• Pond water
• Beneficial bacteria
• Dissolved waste
• Oxygen
• Biological media

As the media moves, bacteria living on its surfaces process dissolved waste passing through the chamber.

BIOFLO is designed specifically to provide suitable surfaces for this type of biological activity.

Benefits in Pond Filtration

When used as part of a correctly designed biological filtration system, BIOFLO provides several advantages:

Large Biological Surface

The extensive protected area gives beneficial microorganisms significant space to establish colonies.

Efficient Use of Filter Space

A large amount of bacterial surface area can be contained within a relatively compact filter chamber.

Good Water Circulation

Large openings allow water to move freely through and around the media.

Protected Biofilm

Internal surfaces provide protected areas where bacterial biofilm can develop.

Suitable for Aerated Moving Beds

The media can be kept in motion within an appropriately designed aerated biological chamber.

Durable Construction

Virgin HDPE construction provides a rugged carrier suitable for demanding biological filtration applications.

Suitable Applications

BIOFLO can be used in:

• Koi pond moving bed filters
• Garden fish-pond filtration
• Biological pond-filter chambers
• Large ornamental fish systems
• Fish-holding tanks
• Recirculating Aquaculture Systems
• Aquaculture filtration
• Moving Bed Biological Reactors
• Integrated Fixed Film Activated Sludge systems
• Industrial biological treatment
• Municipal treatment systems
• Large water-treatment tanks

MBBR Applications

Moving Bed Biological Reactor (MBBR) systems use suspended carrier media to provide surfaces for attached bacterial growth.

BIOFLO is designed for this type of application because:

• It provides extensive protected surface area
• Water can circulate through the media
• The elements can remain suspended in the reactor
• Biofilm develops on protected internal surfaces
• Large quantities of bacterial biomass can be supported

RAS Applications

Recirculating Aquaculture Systems (RAS) continually treat and reuse water within fish-holding or production systems.

Biological filtration is an important component because fish continually produce dissolved waste.

BIOFLO provides the biological carrier surface required for microorganisms to colonise within appropriately designed RAS filtration systems.

IFAS Applications

Integrated Fixed Film Activated Sludge (IFAS) systems combine suspended biological treatment with attached biofilm growth.

Carrier media such as BIOFLO provides additional protected surface area for microorganisms within these engineered treatment systems.

How It Works

BIOFLO media is placed inside a suitable biological filtration chamber.

Water containing dissolved waste enters the chamber and moves through and around the media.

Beneficial microorganisms gradually colonise the protected surfaces of the BIOFLO elements and form a biofilm.

In moving bed applications, aeration or suitable water movement keeps the media circulating throughout the chamber.

The movement exposes the biological surfaces to:

• Pond or process water
• Dissolved nutrients
• Oxygen
• Waste compounds requiring biological treatment

The media itself does not mechanically remove all waste or instantly establish biological filtration. Instead, it provides a specialised physical habitat where the beneficial microbial population can grow.

Setting Up BIOFLO in a Pond Filter

When installing BIOFLO in a suitable moving bed chamber:

1. Confirm that the filter is designed for moving biological media.
2. Determine the recommended media volume for the chamber.
3. Make sure the chamber has suitable media-retention screens.
4. Add the required quantity of BIOFLO.
5. Provide appropriate aeration or movement according to the filter design.
6. Check that the media circulates throughout the chamber.
7. Avoid overfilling the chamber to the point that media cannot move correctly.
8. Allow time for beneficial bacteria to colonise the media.
9. Monitor pond-water quality while the biological filter matures.
10. Maintain suitable oxygen and water circulation.

Always follow the requirements of the specific filtration system.

Biological Maturation

Fresh filter media should not be expected to provide maximum biological filtration immediately.

Establishing a mature biofilm takes time and can be influenced by:

• Water temperature
• Dissolved oxygen
• pH
• Fish stocking density
• Feeding rate
• Existing bacterial populations
• Water chemistry
• Flow through the filter
• Available nutrients

During filter maturation, pond-water quality should be checked regularly.

Product Specifications

Brand: Aqua Source
Product Name: BIOFLO Filter Media
Product Type: Biological carrier filter media
Material: Virgin HDPE
Individual Dimensions: Approximately 16.75mm × 5mm
Protected Surface Area: Approximately 800m²/m³
Total Surface Area: Approximately 1036m²/m³
Available Volumes: 25 litres and 50 litres
Filtration Type: Moving biological filtration / biofilm carrier
Suitable Systems: MBBR, IFAS and RAS
Suitable Aquatic Applications: Garden fish ponds through to large tanks
Category: Filter Media
RRP Range: £49.95–£89.95

Available Sizes

25 Litres

A convenient quantity for appropriately sized biological filter chambers, system additions, or media replacement.

50 Litres

A larger quantity for higher-capacity moving bed chambers and biological filtration installations.

The appropriate quantity should be determined from the filter design and system requirements rather than pond volume alone.

Ideal For

• Koi pond owners
• Garden pond filtration
• Moving bed filter users
• Koi filtration upgrades
• Large fish-holding systems
• Aquaculture facilities
• Recirculating fish systems
• Filter manufacturers
• Professional pond installers
• Biological wastewater treatment
• MBBR systems
• IFAS treatment systems