Just want too clarify another point also when I talk about NACL I am talking about NACL FREE salt.
Of course NACL is salt
Part C is NACL "FREE"
You got me going back checking my typos now before the RC crew go picking up on them!
Part C is everything you find in reef salt minus the salt, NACL FREE PART C are your balancing elements that is added to your system which binds to the free swimming sodium chloride making balanced "reef salt" in effect