Brand:

Grange Marketing 

Alfagrog media looks like cinders, has a very high surface area making it an ideal material on which beneficial bacteria (Nitrosomonas and Nitrobacter) can colonize, making for increase biological filter performance and increase rates of ammonia and nitrite decomposition. The product is porous you can literally blow through it.

The manufacturing process responsible for producing Alfagrog bio filter media ensures that no substances are present to adversely affect the health of fish or plants.

1 Litre of Alfagrog (approx 500gm) is sufficient to purify 1,000 litres of pond water with normal stocking density. If you have a high stocking density then increase the amount to 2 litres per 1000 litres of pond water.