Thanks for the very fast reply.
The tank is .75 cubic feet (8"x44"). The installation company said it is filled with 1.0 cubic feet of resin.
I looked at the cost difference between .75 and 1.0 tanks and found around $10 - $20 difference so I'm not sure why they selected the .75. Unless it's a size they had available.
Hardness is 4.5 and iron is .5, however I do have a second .75cf tank for iron and sulphur. Valve is AutoTrol 255.