I go through a bucket a month and only occasionally check the chemisty on new saltwater before I use it. However I have used all of those brands at one point except the regular Tropic Marin. I've also used Seachem Reef, Kent and Red Sea.
My newest instant ocean bucket actually has a higher level of calcium than the H2Ocean bucket that I tried and both are low in magnesium in my opinion.
The only problem I've ever had with salt was when I left a batch of new saltwater using seachem reef salt mixing for a month before using it for a water change. The tank immediately experienced a minor crash where 2 fish and a brittle star died. Aside from that unfortunate event I havent had any problems or successes using different brands of salt.
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