Python Multi-Purpose Bio-Support is a water treatment solution that jump-starts aquarium filters, rapidly establishing a healthy biological balance in freshwater and marine ecosystems. Easy to use and packed with live beneficial bacteria, this concentrated formula also helps break down toxic organic compounds such as ammonia and nitrite, creating a safe environment for fish. This product is recommended for use in new aquariums which lack established populations of beneficial bacteria. To accelerate the breaking down of excessive organic toxins, use this product in combination with Python Multi-Purpose Bio-Clean. Multi-Purpose Bio-Support is Step 2 in the three step Python water treatment system, along with Pythons Multi-Purpose Water Conditioner and Multi-Purpose Bio-Clean. Safe for use with aquarium fish, invertebrates, and plants. 67.6 fl oz of Python Multi-Purpose Bio-Support treats 4,000 U.S. gal of water.