Halazone Tablets For Solution USP 4mg, are used for making water free form Bacteria and Germs responsible for water borne diseases. The mass of each tablet is 100 mg which releases 2mg of chlorine sufficient to chlorinate 1 ltr of water. Dissolve one tablet in one litre of water to be treated and allow 30 minutes time to react. Water will then be ready for potable purposes. Available in amber coloured glass bottle. Shelf life is 18 months from the date of manufacture.