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Children Boogie
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It depends on what type of calcium you're talking about and level of purity. You can get food grade CaSO4, gypsum at a Chinese grocery store. It's used to make tofu. You can buy industrial grade gypsum at the hardware store and maybe at the art store.
 

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how about throwing some small piece of lime stone in your tank
Unless you grind it into powder first, it's kinda hard to accurately dose.
 
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