Magnesium sulphate (Epsom salts, commonly used in the float industry) and magnesium chloride (Dead Sea salts) are both magnesium salts. When either magnesium chloride or Epsom salt is diluted in water, their bonds separate. If both products are diluted into bath water simultaneously, you would have three separate minerals.
Transdermal therapy is one of the most effective methods of absorption. Alternating between the two products can be highly beneficial: use Epsom salts for floating and magnesium chloride in your bath at home. This ensures you are replenishing your cells with all three essential minerals.