Alfagrog Biological Filter Media

Alfagrog Biological Filter Media

Alfagrog Biological Filter Media is a lightweight porous ceramic filter media for biological filtration in pond systems and in coldwater, tropical and marine reef filters. Its structure gives beneficial microorganisms a large surface to colonise, which supports cleaner water in your filter. It suits pond keepers and aquarists who want an inert, pH-neutral media for a biological filter stage.

What Is Alfagrog?

Alfagrog is a lightweight, strong and inert porous ceramic. Its very high surface area makes it an excellent home for the microorganisms that drive biological filtration. The range is produced under controlled conditions in Staffordshire, UK. Carefully selected clays and raw materials are quickly sintered at high temperatures to form a foamed ceramic structure full of pores. The material is then crushed and sieved to a suitable particle size.

Key Benefits

• Extremely high surface area for beneficial bacteria to colonise
• Highly porous ceramic structure
• Inert and pH neutral
• Lightweight and strong, so it is easy to handle and load into filters
• Economical compared with many other filter media
• Available worldwide
• Made without harmful substances, so it is suitable for fish and plants
• Different grade sizes to match different water flow rates

Why Is Alfagrog So Effective?

Effective biological filtration depends on choosing a media with the maximum surface area. A larger surface lets beneficial bacteria thrive and break down waste in the water. Alfagrog stands out because its surface area is exceptionally high compared with other filter media on the market.

The manufacturer's comparison chart shows that, in theory, about 20 times the volume of foam would be needed to match the filtration level of Alfagrog E40. For Alfagrog E25 it would take nearly 40 times the volume. This means a smaller filtration unit filled with Alfagrog can deliver the same results as a much larger unit filled with inferior, and often more costly, media.

Suitable For

• Pond filtration systems
• Coldwater aquarium filters
• Tropical aquarium filters
• Marine reef filters
• Both freshwater and marine environments, as the material is pH neutral

Other Applications

• Use it as decorative gravel in aquariums
• Use it to aid aquarium landscaping
• Larger pieces can work as a replacement for live rock
• It can also be used in various other applications

Specifications

• Material: lightweight, strong, inert porous (foamed) ceramic
• pH: neutral
• Grades: Alfagrog E25 and Alfagrog E40
• Manufacture: clays and raw materials sintered at high temperature, then crushed and sieved
• Piece sizes: exact sizes vary due to the nature of the product

Available Sizes

• Grade sizes: 25mm / 40mm
• Sack size: the range includes a 15L Sack (+- 19kg)

Different grade sizes give different media surface areas for different water flow rates.

What's Included

• Alfagrog porous ceramic biological filter media, supplied in a sack in your chosen grade and size

Frequently Asked Questions

What is Alfagrog made from?
It is made from carefully selected clays and raw materials that are quickly sintered at high temperature into a foamed ceramic with pores. The ceramic is then crushed and sieved to size.

Can I use Alfagrog in both freshwater and marine set-ups?
Yes. It is inert and pH neutral, and is suitable for ponds, coldwater, tropical and marine reef filters.

Which grade should I choose, 25mm or 40mm?
Alfagrog comes in different grade sizes to give optimal media surface area for different water flow rates. The manufacturer's comparison shows E25 delivers a higher theoretical surface area than E40, at nearly 40 times versus about 20 times the volume of foam needed to match it. Choose the grade that best suits the flow rate and space in your filter.

Will the pieces all be exactly the same size?
No. The media is crushed and sieved, so exact piece sizes vary from piece to piece.

Can Alfagrog replace live rock?
Larger pieces can function as a replacement for live rock. Alfagrog can also be used as decorative gravel or to help with aquarium landscaping.

Does Alfagrog change my water's pH?
No. The material is inert and pH neutral, and it is made without harmful substances, so it is suitable for use with fish and plants.

When can I expect delivery?

• Gauteng (Jhb/Pta) - 1-3 working days
• Nationwide (Cpt/Dbn+) - 2-5 working days
• Outlying Areas - 3-7 working days

All orders are sent via Economy Road, typically through Fastway or Internet Express Couriers*. Estimated timeframes are not guaranteed. Once the order is collected by the courier, we have no control over third-party logistics and cannot make any time promises.

If you prefer a faster 🚀 shipping option, we also offer The Courier Guy during checkout in the dropdown selection. Please note that this option is not free, and you must choose it to use it. Please pay careful attention to the cutoff times and delivery timeframe for these options during checkout.

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Delivery times to lockers and pickup locations typically range from 2–7 working days, depending on your location.*

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Collection timeframes:

• Bob Box: Collect within 2 days of receiving your collection notification.
• PUDO Lockers: Collect within 36 hours of receiving your collection PIN or SMS notification.

If a PUDO parcel is not collected within 36 hours, it will automatically be transferred to the nearest PUDO Kiosk or Depot at no additional cost. The parcel will then be held there for approximately 2 days before being returned.

Please ensure you collect your parcel within the applicable collection period. Uncollected parcels will be returned to the sender, and additional shipping charges may apply should the order need to be resent.