If you want to get fancy,you can get beer captured and on page 177 in the book , their is a ppm guide lines for each beer style and then get BeerSmith and do the calc ,really simple if you have BS
this is one of those things that is added to that all the small steps make a difference at the end results ,
You would not want to see my water report from wards my hardness was 218 and temp was 175
Put it this way I could do a barley wine or stout and thats about it ,I brewed for about two years before buying an RO unit from air, water and ice ,the ED unit and a 20 gallon tank cause I brew 10 and 20 gallons at a time , my beers did and about face when doing water profiles, and plate chiller ,adding oxygen to the wort, it was all those things that combine made a better beer all together
I use RO in all my beers now and with a lot better results then a hard well water, the saying goes of you like your water you will like you’re beer ,I find that to be not true , I brew several kits and all grains and always had a bitter or a taste that I didn’t like until I stared using this method
Hope this helps