Dr. Tim's Waste Away Time Release Gel is a specially formulated bacterial additive designed to break down fish waste in hard-to-reach areas of your saltwater reef tank. This natural bacteria gel helps dissolve sludge and hidden wastes, enhancing the overall water quality by increasing ORP levels and boosting protein skimmer efficiency. Each package should be replaced every 30 days when it changes to a tan color, indicating that it's time for a fresh supply. The Waste-Away Gel is ideal for use in tanks up to 200 gallons, making it an essential tool for maintaining clean water conditions in your reef aquarium.