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![15kg Alfagrog Filter Medium 15kg Alfagrog Filter Medium](https://ndaquatics-store.co.uk/215-large_default/15kg-alfagrog-filter-medium.jpg)
More info
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.