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- Jul 16, 2009
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...welp everyone already gave you the same advice I posted without reading ahead. You are in good hands.I calibrate my refractometer with RODI water so it reads 0 and did a test batch of mixed salt water per instructions on the bag (exactly 1 galon of RODI mixed with 1/2 cup of salt) and it measured exactly 35ppt. Is 1200 ok you think?