Aquascape Pond Starter Bacteria helps to quickly establish the biological ecosystem for new ponds and spring start-ups, helping to support the nitrogen cycle and provide clean and healthy water conditions. Starting your season right with Pond Starter Bacteria will allow you to spend more time enjoying your water feature and less time maintaining it throughout the year. Pond Starter Bacteria is completely safe for fish, plants, pets, and wildlife. Can be used in water temperatures of 40° and above.