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I got out of saltwater 5 or so years ago and if memory serves me right the color code cards are different for freshwater than for saltwater even tho the tests are the same. (API brand)
+1 to Blert
Actually, all of the individual API tests are labeled and sold for both fw/sw- they are not seperate tests. Only the master kit has a distinction of being marketed as fw or sw but the tests are the same.