Buy Zechstein Pure Magnesium chloride Flakes - 1KG Our Magnesium Chloride crystals are sourced directly from the ancient and pristine Zechstein seabed. This pure and ancient seabed is home to the world's purest form of Magnesium Chloride. Our Magnesium Bath crystals are perfect for that warm, soothing relaxing bath which will leave you feeling revitalized and relaxed. You can also make a warm foot soak which is perfect for those tired and aching feet. A warm Magnesium bath will aid tired and aching muscles and should leave you feeling energized and relaxed ready for the next day. Top Athletes have used the very same Crystals post training with great recovery results. As well as all these benefits you will also be recharging your .