PuriResin Aquarium Filter Media, Organic Filtration Resin, for Freshwater and Saltwater Fish Tank, Removes Driftwood Tannins, 10

This IOAOI filter media is a premium macro- porous synthetic adsorbent which can adsorb larger size soluble and insoluble impurities. It controls ammonia, nitrites and nitrates by removing nitrogenous organic waste that would otherwise release these harmful compounds Regenerated. Color changes from light yellow to dark brown, even black while it adsorbs the waste. Once it is exhausted, it can be regenerated with a solution of bleach and water. For both freshwater and marine aquariums.