Stock water stabilizer for KOI fish tank Treatment of White Fungus, Gill Rot, Tail Rot, White Spot, Parasites Worms Bacteria for Koi, Gold Fish & other fresh water fish No harm to water quality Safe recovery without Side Effects Usage Method: Add 5ml of this product to every 100L of water. Use it every 3 days Use 23 times/ weeks. Change 1/3 of water before using for better results Expiry Date is 2 years from the manufacturing date on the packing Note: Increase the oxygen supply when using