Sodium Chlorite flakes

Hi there, just wanted to check that PforLife has the correct amount of chlorite? I can't find any information on it. In Andreas Kalcker's book, he says it should be 1% but just want to see if anyone knows exactly. 

They sell 80% sodium chlorite flakes, which is what we use to make a 22.4% sodium chlorite solution or MMS, from a 28% solution, as defined by Jim Humble.