Well as for the salt not dissolving all the way that is a minor issue. No worries there....
The 29dKH however is a problem. Since you haven't put anything in the tank yet I would wait for sure! Test your tank water for dKH
and see what you get. If it is off the charts then you have an issue. I would strongly recommend getting RO
water or buying an RO
unit and use it. If your water is that hard out of the tap then you would do well to not use straight tap water!
in my system is 9, just tested it this morning....