15% is fairly high - not as high as dairy milk, but about as high as soy milk. Look for Almond Breeze brand almond milk or unenriched rice milk instead. Yes, tricalcium phosphate is added to make the nutritional qualities more like milk, primarily for calcium.
In general, nuts are no-nos, but Almond Breeze brand lists the phosphorus content, which is 2%. Potassium is higher than rice milk, but not as high as soy milk. If you don't like rice milk or almond milk, I doubt you'd enjoy hemp milk either.