At Whole Foods in Dallas, TX.  50 ppm is called Low Potency.  There are also 
medium
and high potencies by the same company.  

    
    Does 2 teaspoons of 50 ppm equal 1 teaspoon of 100 ppm? 
    Yes, but where are you going to find 100 ppm CS or even 50 ppm???

  I would be very carefull of it!! 
  "Ole Bob"