Brightwell AquaticsXport PO4 Cubes - High-Porosity Cube Filter Media for Phosphate & Silicate Removal from All Ponds & Freshwater & Marine Aquariums, 250ML (XPCubeP250)

Just recieved my Xport po4 cubes today, i wanted an easy to use ferric oxide media to pop in my canister filter without the mess or the downfalls of bagged gfoIt rinsed VERY easily (just dipped in RODI a couple of times and it was clean) popped a couple of cubes in done ...with the surface area of the porous media i can easily see it performing at least as well as other gfo options