Specially Formulated for Decorative Fish Ponds, Lagoons & Smaller Water Features. Creates a cleaner environment for your pond, promoting faster fish growth. Reduces ammonia nitrogen levels. Dissolves away organic sludge. Seeds and maintains biological filters. Significantly reduces noxious odors caused by dead algae, fish fecal matter, and urine. Reduces hydrogen sulfide, which creates strong, offensive odors. Reduces biological oxygen demand (B.O.D.). Reduces buildup of bird droppings, fish feed and dead leaves. Breaks down dead algae. Improves dissolved oxygen levels. Contains photosynthetic bacteria which reduces cloudy water by promoting flocculation and settling of organic and inorganic particles. Effective over a wide range of pH conditions. Continued biological activity even in water temperatures under 55°F. (12°C.). 32 oz. (10PLQ) Treats 500 gal. pond for 11 months or 1,000 gal. pond for 8 months.