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I just purchased a reverse osmosis system for my all grain system and used a water profile that asked for almost 39g of Gypsum for a 10 gallon batch. We treated enough for 15 gallons that included the hot liquor tank. Our local brew shop had given us the Burton-on-Trent profile that came from Pro Mash. In the profile it called for 2.6 grams of Gypsum per Gal. Is that right? Did we read it wrong? or was Pro Mash wrong? When I looked at the Gypsum bottle after brew day I noticed that it says to add 1 to 2 tsp per 5 gal. Of course I read it after brew day. Our estimated starting gravity was 1.054 and our actual starting gravity was 1.043. Big difference!