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Old 12/07/2017, 06:17 PM   #8
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,324
I agree that baking soda is less likely to cause precipitation of calcium carbonate, but you might be fine with soda ash, particularly if you dose slowly or into a large volume of water. Baking soda is inexpensive and easy to get, though.

Jonathan Bertoni
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