Aquascape Beneficial Bacteria 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. Because ornamental water gardens are enclosed ecosystems, sometimes factors like fish load, uneaten fish food, organics such as leaves, sludge and unwanted debris may disrupt the balance. Aquascape Beneficial Bacteria maintains a strong biological balance; providing clean, clear and healthy water conditions. PSB (Photo Synthetic Bacteria) help quickly clear pond water by clumping fine debris and allowing it to settle.