High Calcium HRdness

In Nevada no question we have hard water, but with a test at 1100 the advice was drain 61% of pool volume. Isn’t that going to throw off all other settings? Is there any other alternative?
Yes, but it is easy to recover. The only other alternative is Reverse Osmosis treatment. I'm not recommended any of these, but the service is available...
 
With. CH of 1100, you need to drain the entire pool and refill.

What is the pH, TA and CH of your fill water?

RO will also affect your other chemical levels.