Healthy Ponds All Purpose Water Cleaner 100 is a water maintenance product designed to keep aquariums, fountains, rain barrels and water features from 10-100 gallons clean, clear and free of green organic growth. The Healthy Ponds unique patented time-release system delivers a proprietary blend of naturally occurring bacteria and enzymes into the water 24 hours a day, 7 days a week for 30 days. This easy to use, all natural product is veterinarian approved and safe for fish, plants, birds, animals and humans. Correcting water problems naturally occurs with time and continued use. Every water feature is different, therefore results may vary. Some waters will respond more quickly than others due to their specific water conditions. Over time, the bacteria and enzymes will work to reduce organic debris found in water. Water may take on a cloudy appearance for the first few days, while bacteria begin to work. With continued use of Healthy Ponds products, you can expect to improve and maintain water quality and clarity, while eliminating odor. Includes reloadable dispenser with 2 30-day refills. Treats up to 100 gallons for 60 days.