In using Brun Water to build up my DI water to match Wicklow Mtns Ireland low mineral profile the ions are balanced until I start adding Phosphoric Acid to get my mash pH down to the 5.2 I want for my Guinness clone. Is this ok or do I need to manipulate my mineral addition to attempt to get back in balance at the likely risk of being way off the low mineral content for Wicklow Mtn Ireland water?