I decided to use the carbonate as it is. If I try to take the water out of the crystals, I can't be sure how much water is left when I'm going to weigh the powder. Now I know that I have to use 2,7 times the amount if the recipe says anhydrous carbonate.(posted 8331 days ago)Sheesh! Hate the clumping! Next month I will buy 1000g of anhydrous carbonate instead. >:-|