LOL yea that could have been really bad! I am weary of using additives in general but i used roughly 3% and even smaller amount of salt which i maybe could use a little more? I also read somewhere that if you let it sit for a week the sodium carbonate "mellows" out a bit more but not sure how true that is.This sounds like a reasonable amount! I was genuinely a little worried. Glad to hear it was just using the wrong unit of measurement.