Add 5 mL (1 tsp) per every 40 L (10 US gallons) every two weeks to maintain correct iodide levels for freshwater shrimp. If using with humate soils, dose once a week. This dose will raise iodide by 0.006 mg/L. Do not overdose this product. It is recommended to wait at least 2 weeks before using on newly purchased shrimp.