Use one Xport Bio Brick for every 750 U.S. gallons (2,835 L) of system capacity, more for heavy bio loads. Rinse material well with aquarium water or purified tap water. For superior results, seed the material using Florinbacter7, Microbacter Start XLF, Microbacter7, or Florinbacter Clean, as appropriate for your aquarium, by placing Xport Bio Brick in a plastic container, filling it with aquarium water, and then adding the full recommended dose of either bacterial product, based on the size of your aquarium, to that container. Allow to stand overnight and then add the seeded Xport Bio Brick to your system. Discard soak water. It is recommended that you use sponge, fine filter floss or other mechanical filtration ahead of Xport Bio Brick to prevent clogging with organic material. For maximum results, also provide a good carbon source for growing bacteria, such as Brightwell FlorinAxis as directed on its label. Caution: Keep out of reach of children. Not for human use or consumption.