Pond Logic Nature's Defense Packets, 24 ct. Promotes a healthy ecosystem, resulting in clear water. Eliminates nutrients such as phosphates and nitrogen. Seeds and maintains biological filters, reducing toxic ammonia levels. # Helps maintain oxygen levels, breaking down muck and sediment 100% natural & safe for people, pets, fish, waterfowl & wildlife. Treats 2,000 gallon pond for up to 6 months.