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					Originally Posted by  hillegom
					 
				 
				How are you mixing it? Doesn't have to be messy. I put a tablespoon of baking soda into about 300-500 ml of RO , heat in microwave for 40 sec. and then mix. 
Use this calculator to figure out how much to add to your water.
 http://reef.diesyst.com/flashcalc/flashcalc.html 
			
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 I'm using Randy's recipe. I need 594ml or 2 1/4 cups of baked baking soda for 1 gal container.  I mix it with RO warm water but still it dissolve clumps forming at the bottom, so I go little by little and it takes a lot of time and when I stir it always spill.