TL ReefsGFO Phosphate Remover, Granular Ferric Oxide, for Saltwater Aquariums (1lbs)

Really dusty and extra small grain sizes. Make sure you have a really fine mesh bag or reactor. Works quickly.

I try to buy bulk consumables as much as possible. For the time being I fill mesh zipper bags with the GFO media and put them inside my hang on back filter. Soon I will be switching to a more efficient way to use the media. I purchased a universal media reactor for different types of media. I plan on mixing GFO and Activated Carbon and filling the reactor with the mixture. By using a DC pump I can control the water flow through the reactor for best results.

I added it to my filter and saw results within 24 hours. After a few days my phosphorus was almost undetectable. I tried many other products, but this one worked great. And it didn't affect any of the fish or seahorses in the tank.

It works but its Too dirty nd it doesn't last as long as other brands I've used. Wont buy again

I'm not sure what all these other reviews are talking about with the high dust. I rinsed mine pretty well and it did have a little more dust once turned on, but my tank cleared up. I have the reactor infront of the skimmer so that it catches any by product released from the reactor. All depends on your filtration if you ask me. NOW, this product works! My phosphates were at .16 ppm and this GFO reduced them to .04 ppm after one day! This product works. Just know how to use it. Rinse it, rinse it again, and rinse some more. Then add to the media reactor, you don't need much. If you jam pack the reactor then it will clump and sludge. I didn't even use the recommended amount from the bad directions, I used less and it still worked! You want the media to gently tumble in the reactor and not going too crazy. If you know how to use it, then it will yield great results.