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Hi I found this page, looking for the CYA content of the chlorine tabs I bought in France: http://ile-de-france.sante.gouv.fr/santenv/legion/prodpis.htm Trouble is, I don't fully understand the numbers. So Cl2 = 50 and trichloroisocyanuric acid (C3Cl3N3O3) =1934, but what? milligram? The...