Aquascape Pond Starter Bacteria rapidly establishes the biological ecosystem in your pond. Ideal for new ponds and spring startups, this eco-friendly additive helps ensure that your pond get off to a good start! It offers support to your pond's nitrogen cycle, helps reduce spring fish loss and is completely safe for fish, plants, and animals. For quick, easy and accurate dosing, Pond Starter Bacteria comes in a convenient pump bottle. This 33.8 fl oz bottle treats up to 20,000 gallons of pond water (1 pump treats 100 gallons).