100% Orange Juice

I read this ingredient list on the container of an orange juice carton stating that it was 100% orange juice:

 

 

 

  1. Filtered water
  2. Concentrated orange juice
  3. Tricalcium phosphate
  4. Calcium lactate
  5. Monocalcium phosphate (calcium sources)
  6. Cholecalciferol (vitamin D3)

So because I am a product of the Ontario public education system, my first question is – if it is 100% orange juice, why are there 6 ingredients?  How can you have 6 ingredients, and then say that 1 of those ingredients constitutes 100%? If my math is correct (honed in the Ontario public education system), 100% of one item is the full amount, an indication that it is pure – there is nothing else. 

My second question, a two parter – why are we limited to monocalcium phosphate and tricalcium phosphate? Why don’t we also get dicalcium phosphate?

And my last observation – I find it odd that I don’t even know what more than 50% of the listed ingredients are in 100% pure orange juice!

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