How to Add Magnesium Chloride to Your Spa


Magnesium chloride is a therapeutic compound used by many people to improve digestion and as a dietary supplement. Magnesium chloride comes in many forms including flakes and powder, and it can even be dissolved in oil for use in massage. Magnesium chloride baths provide a means for the body to absorb a healthy amount of magnesium transdermally, without the discomfort of taking the supplement orally. Spas are a prime venue for a magnesium chloride bath because of their ability to rapidly circulate water and therefore dissolve the magnesium chloride effectively. Applying magnesium chloride to a spa's water involves measuring the correct amount of the chemical for the amount of water in the spa and pouring the mixture into the water.

Things You'll Need

  • Magnesium chloride
  • Measuring container
  • Brush or stirring utensil
  • Measure out 1 lb. of magnesium chloride flakes or oil into a container. Pour the magnesium chloride directly into the spa water. Add another pound of magnesium chloride to the spa and repeat until the desired level of magnesium chloride is reached. Typically 2 to 4 lbs. of magnesium chloride are used for a single spa treatment.

  • Turn the spa on, and activate the jets to begin circulating the spa's water. Allow the spa to circulate for several minutes to dissolve the magnesium chloride.

  • Stir any undissolved magnesium chloride flakes resting on the bottom of the spa by hand or with a brush. Stir until the residue is fully dissolved.

Tips & Warnings

  • Clean your spa after the magnesium chloride treatment to keep the spa surfaces from forming scale buildup.

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  • Photo Credit pool spa 1 image by Aaron Kohr from
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