PhosBan from Two Little Fishies is a favored chemical filter media because it will not leach substances back into your aquarium. Largest adsorption capacity of any phosphate filtering media. Ferric oxide hydroxide-based granules also adsorb organics and other pollutants. Use just like activated carbon.
does not release adsorbed substances
Recommended by Julian Sprung for long-lasting and easy control of phosphate levels on a permanent basis.