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I have never used it personally but the numbers seem way too high if you run it at 1.026 SG. They may have higher cal and alk but for that price not much else.
I have always ran DSB's in my tanks over the years. It really depends on the amount of flow.
Rule of thumb is the finer the better but there will be some areas that may need a course sand.
For the bed to function well it must be at least 4 inches in depth.
Best of luck