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Q. Why does the cRc require a Pesach hechsher on unflavored seltzer?

A. There are several ways to collect carbon dioxide used to create seltzer, and one of them is as a byproduct of the production of beer or whisky. Of course, beer and (just about all) whisky is chametz, and there is a difference of Rabbinic opinion as to whether the chametz status transfers to the carbon dioxide gas.  Some are of the opinion that since carbon dioxide is a gas, and it is “scrubbed” of all chametz taste, it is permitted on Pesach, even though it comes from a chametz source.  The cRc follows the stricter opinion that treats the gas as chametz, since it is direct result of the beer or whisky production.