I am testing out the NP Biopellets to try and reduce my phosphate levels to 0.00 ppm, they are currently at 0.07 ppm according to the Hanna Phosphate Photometer and I still have hair algae growing on the overflow and on my frag rack. I added 500mL of the Biopellets in a Phosban 550 reactor powered by a Maxijet 900. The pellets look like vanilla chocolate chips and sink when placed in water. I will add 10 drops of Brightwell MB7 in front of the maxijet daily to help cultivate a bacteria population on the biopellets. I am starting with 500mL of Biopellets but in three to six months I will run a total of 1L of Biopellets.