Aquascape Pond Starter Bacteria Professional Grade 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. Each bottle is 25% more concentrated than the consumer equivalent, making it the ideal choice for discriminating pond professionals. Starting your season right will allow you to spend more time enjoying your water feature and less time maintaining it throughout the year. The included measuring cup and dosage guide make application simple and easy. Each bottle contains 1 gallon (3,78 litres) of treatment and treats up to 96,000 gallons (420,000 litres) of water. Pond Starter Bacteria Professional Grade is safe for fish, plants, pets, and wildlife.