I have always used Bru'n water for water adjustments including ph. I use 85% phosoric acid. I tried using beersmith for the first time and got a different amount to get to the same ph, 5.4. 2 ml for 3.5 gallons Bru'n vs 5 ml beersmith. I use ro water and that was in both. I don't have the ability to test it right now, my bulb is dead on my meter, has been for years. Has anyone else noticed this? If so which one has been closer to accurate? Thanks