Direction to use: 1. Add 3 grams per 250 liters of water when setting up a new tank. (A full spoon volume is one gram) 2. Use once a week, adding 1 gram per 250liters of water. 3. Shake well after mix the powder with little water by a bottle. Add it evenly to the aquarium, filtration tank or filter media will effect better. 4. Recommend using "NitriPro"and"NitraAct"together to achieve the best efficiency of water purification.

• Decomposes mass pollutants in the gravel rapidly. Eliminates bad smell. Makes gravel recover to the best purification situation.
• Eliminates toxic hydrogen sulfide and efficiently.
• Removes growth of planaria efficiently.