gillmanjs wrote:My water is fairly hard and I am trying to make a New Belgium Mighty Arrow clone. I have used Palmer's spreadsheet to reach my target RA, CA, and Chloride to Sulfate rate, but the last time I brewed, I think my ph dropped too low. As an insurnace policy, I have considered adding Five Star 5.2 stabilizer. Has anyone else done this? What effect do you think it would have?
Unless you were brewing something with a LOT of black malt or you added mineral or lactic acid or used acidulated malt it is unlikely that your pH actually went too low. It would take a gram of calcium chloride dihydrate per liter of treated water to pull mash pH down by 0.3 points relative to distilled water (expected mash pH 5.4 - 5.5). But if it did then yes, 5 Star 5.2 will tend to bring it back but does not in general have much effect with even modestly "hard" water as it is a phosphate buffer which doesn't have that much buffering capacity at pH 5.2. You are effectively using the basic salts of phosphoric acid to raise pH. There are other salts better suited to doing this. Do you want to add all that sodium and/or potassium (don't know whethe 5.2 is sodium or potassium phosphate mix) to your brew especially given that you have already added other salts?
I think a pH meter or pH strips would be a better form of insurance for you.