Just check the ingredients to make sure it is 95% pure or better is probably a good cut off.
The chemistry store has also got great reviews, but i think might be more expensive.
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Oh and more and more walmarts are carrying the hth 4.5lb calcium increase too, if you don't need much. Another option if you don't need much is to turn down you swg for a while and use cal-hypo until you get where you want.
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