Kinetico s250 softener setup

[Dehkooledt]

I have a kinetico s250 softener, I have hardness of 10 gpg, with iron of 5ppm what is my salt dosage setting supposed to be and which mark do I set my float cup, and I have an accudial head with letters what letter do I set it to, bought a home with this system will love to know how to set it correctly thank you