In most cases phodphate is consumed much less than nitrate, especially in reef tanks with many fish. Whould it not be an idea to make a bactobalance version that will prevent Nitrate from bottoming out and not add phosphate. I just got rid of the GFO reactor. My nitrates finally got near 0 (0-3 ppm) but my phosphate is around 0.1 -0.2. I use Elimi NP and Reff Actif but now i have to add a nitrogen source