I thought you didn't want CO2 in contact with kalk anyways. It will just precipitate out the carbonates and once they're precipitated out they're done, so one wouldn't get a whole lot of benefit from the kalk. That's why a kalk reactor is sealed -- it's to prevent any unnecessary contact with air. Just my $0.02..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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