Salty Q&A: Need Advice on GFO Use

Q: I’m thinking about using GFO in my reef tank, but this product is new to me, so I have a few questions before I go ahead and buy it: Does GFO really do a good job of lowering nitrate and phosphate? Can I just put this product in a media bag and place it … [Read More]

GFO for Reef Aquarium Phosphate Control

Granular ferric oxide, or GFO, is a widely used form of chemical filtration in the reef-keeping hobby today. Chemical filtration, as the name suggests, purifies water by binding up impurities at the molecular level. As water is sent through the medium, the surface of the medium forms chemical bonds with dissolved compounds, thus removing them … [Read More]