Magnesium Flakes (Magnesium Chloride)
Instructions for adult use:-

Dissolve salts in a bath of warm water about 37 degrees celsius.

For muscle relaxation use 500g - 1kg
For children over 3 years old use 100g-250g. Ideally the bath should be before bedtime.
During pregnancy: Use 250-500g and make sure the bathing water is about 36°C and never over normal body temperature.

Relax and soak for 20 minutes 1-2 times per week.

For a footbath, dissolve 250-500gm of flakes in 5 litres of warm water at body temperature (not higher than 36 degrees celcius). Relax and soak your feet for up to 20 minutes. During pregnancy use only 250gm for a footbath.

Precautions:-
Do not use on broken skin. Avoid contact with the eyes. Seek GP advice before use if suffering from a medical condition or undergoing medical treatment.
If irritation occurs rinse with water. If it persists, seek medical attention.
Keep out of reach of children.