Anonymous Modernist 1738

I've really been enjoying the brining section in volume three. On page 3*157, under "The Chemistry of Brining and Curing with Other Salts," I just need a little clarification on this passage: Is the 10:1 referring to 10 parts salt to every 1 part phosphate, or is it 10 parts sodium tripolyphosphate to 1 part sodium hexametaphosphate. If the later, must they be combined together to work properly or can they work exclusive from one another. Thanks for any help you can offer. Jacob