Premium biological filter media

Premium biological filter media for the use in koi ponds, fish tanks and aquaponics. Alfagrog has a massive surface area for bacteria colonization

What is Alfagrog?

Alfagrog is a porous foamed ceramic material, which is lightweight, strong and inert.


It’s high surface area makes it the natural choice for colonisation by micro organisms in biological filtration systems resulting in cleaner water.


Benefits of Alfagrog over other filter media:

  • Extremely high surface area
  • Highly porous
  • Inert, pH neutral
  • Lightweight
  • Economical
  • 500g / 1 liter of media per 1000 liters of water at normal stock density, and 2 liters at higher stock levels. Amount of media also depends on water flow rate.
  • A variety of grade sizes available: 25mm / 40mm

The Alfagrog range of porous ceramic filter media is made under controlled conditions in Staffordshire, UK.


Selected clays and raw materials are rapidly sintered at high temperature to produce a foamed ceramic porous mass, which is crushed and sieved to a convenient particle size.


Alfagrog is available in a wide range of sizes giving the end user optimum media surface area in varying water flow rates.


The manufacturing process ensures that no substances are present to adversely affect the health of fish or plants. The material is pH neutral and can be used in both freshwater and marine applications.


Why is Alfagrog so effective?


The key to effective biological filtration is choosing media with the highest surface area possible to allow beneficial bacteria to colonise and remove waste from the water. Alfagrog has an extremely high surface area by volume compared with other types of filter media on the market.


The table below shows that in theory approximately 20 times more volume of foam would be required to attain the same level of filtration as Alfagrog E40 and almost 40 times as much as Alfagrog E25. This means a smaller filtration unit can be used when using Alfagrog to attain the same results as a much larger unit filled with inferior and often more expensive filter media.

Technical Data


  • 1 litre = R45.00
  • 1 x 25 Litre bag = R1000.00 (R40 a litre)



Phone or email for courier quotes, self pick up welcome.

Close Menu