Lugol's SolutionOverview Brightwell Lugol's is an extremely powerful iodine iodide solution. It should only be used by advanced aquarists. US regulations do not permit the sale of Lugol's Solution in sizes larger than 30mL Instructions and Guidelines Determine the iodine concentration in the aquarium using an accurate test kit before supplementing. Each ml of Brightwell Aquatics Lugols will increase the concentration of iodine ([I]) in 1 US gallon (3. 785 L) of water
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