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The one thing that I don't like about how they did the tests is that the chemicals tested were after using 7.0g of salt in 200 ml of water, which as the first results page shows, leads to a different salinity for each salt mix. I think it would have been been better to show how many grams of salt it takes to get a typical reef tank salinity and then test all of the salts for their chemical totals.
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I agree that this may make more sense for some people for calcium, alkalinity, and the other elemental parameters, but for such readings for conductivity, ammonia, nitrite, nitrate and phosphate having the samples at the same salinity would produce incomparable results. If they did set the salinities at a certain point they should go by the recommended salinity for the specific salt mix.
I also agree that mixing such small amounts and doing only one or two tests for each salt mix isn't enough and will most definitely produce results that may be true for one person but not an accurate average or a good representation of the salt mix in general.