My local tap water if relative high in PH.. In order to get to an appropriate level I am having to add an inordinate amount of salts.. Leading to a salty flavor in my beers.. Advice?
Do that... because the pH of the water doesnt matter so mush as the pH of the mash. Now for the sparge water, you can lower the pH using acids. Keep in mind that your grain bed has some buffering power, so also test your runoff pH when you do this "plain water' test. You may find that the mash acidifies itself enough, and that it contains enough buffering power to overcome a higher sparge water pH.