yes, about the same size as a .45 ACP round...that big bottle with the small amount of crystals in the bottom, it has lasted for many years....Well i'm glad the principle is being applied, now I'm in the search for iodine crystals, will see if Nyerges still can sell them.
Probably should mention the cautions using the crystals, the no. 1 being you cannot swallow them, so when decanting the saturated solution out of the bottle into the cap for measuring the dose to be added to the water container you should look and make sure no crystals got out.
The tablets though stil limit you to a certain number of them, with the crystals the number of saturated vials of fluid they can produce is huge.