Aquascape Liquid Beneficial Bacteria for Pond and Water Features, 32-Ounce Bottle | 98888 Aquascape Beneficial Bacteria maintains a strong biological balance; providing clean, clear and healthy water conditions Contains 8 pure strains of concentrated beneficial bacteria, including PSB bacteria and enzymes This combination of natural cleaners helps to maintain a strong biological balance in your pond PSB (Photo Synthetic Bacteria) help quickly clear pond water by clumping fine debris and allowing it to settle 1 bottle treats up to 20,000 gal./75,684 liters, 1 pump treats 100 gal/378 liters