When I was planning to use tufa in my 150 I was going to get it from http://www.tufa.bc.ca, but I eventually decided against it due to the possibility of metallic impurities.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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