Alfagrog is a very porous biological filter media that has a large surface area for bacteria to congregate in. It is ideal for use in any biological filter system and is very popular among koi keepers and commonly used in multi chamber filter systems. Many pond keepers opt to swap plastic bio media for this material for a longer life and better results.
Swell Alfagrog comes in a handy mesh zip up bag for easy maintenance and is available in two different sizes making it ideal for ponds or aquariums.
Available in two sizes:-
Small bags - 20x30cm (400g)
Large bags - 30x30cm (1.6kg)