hi Dee,  I guess it might depend on the manufacturer...as to 
%...globallight.net has the mms and they even have a kit for 50$ where you get 
enough material..bottles..sodium chlorite..to make I think 13 4 oz. bottles of 
the 28% solution...might be cheaper than the health food variety..also with 
your order thay have a cd that is free if you ask..garyc