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Re: CaCO3 sources
For US customers, call Hach at 800-227-4224 and tell them you want to open
an account for credit card purchases and you would like catalog # 120-01, a
454 gram container of CaCO3 (and ask for a catalog, you will want other
things after perusing it:)
It runs about $40-50 and gets you about a quart sized container of ACS grade
CaCO3 that dissolves easily in the presence of CO2.