AquaMaxx Phosphate Out Pro is a high capacity granular ferric oxide filter media that removes phosphate from aquarium water. Phosphate Out Pro holds up to twice the amount of phosphate as standard GFO! To celebrate the release of this all-new filter media, AquaMaxx is going to give one lucky aquarium hobbyist two quarts of Phosphate Out Pro. Need help lowering phosphate in your tank? ENTER NOW. Registration ENDS at 11:59 PM PST on 3/7/14. Details: Open to U.S. residents 18 years or older. Void where prohibited or restricted by law. Winner will be contacted via email.