Healthy Ponds 51115 Aquasphere Pro Biodegradable Pond Treatment, Treats up to 500,000 Gallons Natural bacteria and enzyme blend reduces excess nutrients, sludge and ammonia, resulting in improved water quality and clarity Treats up to 500,000-gallon Provides 24/7 water conditioning for 30-day Saves time and effort, with no mixing, measuring or mess Safe for humans, pets, fish, birds and plants