brand new and high quality Features: Solves algae problems. Use as organic carbon instead of CO2 (with caution) Reliably combats green, brown, slimy, filamentous (blanket weed), floating and spot algae. Suitable for both Marine and Freshwater. Usage: Get rid of black hair: with a lengthened syringe, spray black hair algae to kill black hair algae. Algae control: add 2-5ml of 2% rong dialdehyde to 100 l of water occasionally to prevent algae from growing. The original solution has a high concentration and can be used after certain dilution. Dilution method: pour 20ml 50% concentration of rong dialdehyde into 480ml pure water and shake well. Safe dosage (after dilution) As the PH of water increases, the effect is better and may cause strong side effects. When the PH value of water is lower than 6.8, for every 100 liters of water, the concentration of Dijon aldehyde added by 2% shall not exceed 20ml; When the PH value of the water is equal to 7, for every 100 liters of water, the addition of 2% Dijon aldehyde shall not exceed 15ml; When the PH value of the water is greater than 7, for every 100 liters of water, the addition of 2% Dijon aldehyde shall not exceed 5ml Notes: 1. This product is suitable for low-temperature storage (the shelf life will be longer) and can be stored at room temperature. 2. Gradually increase from a small amount, and observe the state of fish, shrimp and grass. If there is any abnormal phenomenon, please stop adding and change water properly. 3. When used in high concentration, it has side effects on staghorn moss and pearl grass aquatic plants. 4. Either algae removal or carbon source must be used with lights on. 5. The 50% concentration of this product is highly corrosive. If it touches the skin directly for a long for time, it will cause skin burns. Specification: Material: Liquid Size:3cmx5cm Volume:20ml Quantity: 1 Pc(1 pc of bed only,other accessories demo in the picture are not included!) Note:1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes(without retail package): 1 x Algae Remove