Aquascape Container Water Garden Maintenance Tabs contain 8 pure strains of concentrated beneficial bacteria, including enzymes. This combination of natural cleaners helps to maintain a strong biological balance in your container water garden. Because ornamental water gardens are enclosed ecosystems, sometimes factors like fish load, uneaten fish food, and organics such as leaves, sludge and unwanted debris may disrupt the balance. Aquascape Container Water Garden Maintenance Tabs maintain a strong biological balance providing clean, clear and healthy water conditions.