The API Pond Care Pimafix 16 oz. Koi and Goldfish Anti Fungal Remedy is a water treatment specifically designed for ponds, suitable for use in both outdoor and indoor water features. This solution, made by API, comes with full instructions for easy application. Originating from the United States, this product is effective in treating fungal infections in Koi fish and Goldfish, ensuring a healthy environment for your aquatic pets.