This additive is highly concentrated and contains a large proportion of iodate and also some iodide in the same proportions as natural sea water.
Both are present as their calcium salt as iodate is complexed with calcium in natural sea water and also, by using calcium salts, no ionic imbalance is created as it would be if potassium or sodium salts are used.
8 fl oz treats 25 gallons of water for 50 - 200 weeks.