Crystalpro / Ich Purgo Ich Purgo is an extremely effective liquid water treatment additive against ich (white spot) and other parasites for freshwater and saltwater ornamental fish. Instructions: Add 7 drops for every 5 gallons (or 1ml for every 10 gallons) on days 1 and 3 of treatment. Ensure adequate oxygenation through surface circulation, continue feeding the fish, turn off the lights, and minimize water extraction from the tank; only perform bottom cleaning if necessary. Do not use active carbon or UV lamps during this process. Increase the temperature by 2-3 degrees Celsius. If the disease persists, repeat the same dosage on days 5 and 7. At the conclusion of the treatment, perform water changes for two consecutive days. Active carbon can be utilized to fully remove active substances from the water. This product can be added directly to the aquarium, although application in a separate quarantine tank is recommended. It is safe for aquarium plants but harmful to invertebrates, crustaceans, anemones, and corals. Cautions: Keep out of reach of children. Not for human consumption. When eye or skin contact, wash with plenty of water. Keep it cool. Do not freeze. Approximately 15 drops is 1ml, a bottle cap is 7ml. Shake the bottle well before use. Do not overdose. In this case, change the water. It can dye skin, fabrics and aquarium sealant and ornaments blue on contact, use with caution. Ingredients: Malachite green, Polyvinylpyrrolidone, pure water.