Did you add the water to the powder or the powder to the water? They'll probably just be clumps of powder. They'll dissolve or settle. You can get lumps like this if you add too much powder at once, so the calcium I buy is in flakes, which is much better for mixing, as they all dissolve like little pills.
I get mine in bulk from a chemical supplier, so saving on the cost of Red Sea's graphics designer. :tongue: