Features 100% Organic Herbals Based On Naphthoquinones For Fresh and Saltwater Aquarium and Pond Conditions; Helps Prevent and Treat Single-Celled External Fish Diseasescaused By White Spot Disease (Ich), Other Protozoans, and Fungus; Equally Effective In Fresh and Salt Water; Does Not Require Water Changes Between Treatments; Safe For Use With Aquatic Invertebrates (Snails, Shrimp, Crabs, Coral, Anemones, Etc.); Treats 240 Gallons; Capacity - 4 oz.; Item Weight - 0.35 lbs.