How to separate water from aqueous magnesium sulphate?

We have that This Separation is done by heating the Mixture to form magnesium sulfate crystals

Pressure is then applied to the magnesium sulfate crystals causing a collapse to give Reduced hydration of magnesium sulfate crystals

From the question we are told

How to separate water from aqueous magnesium sulphate?

Generally

Water

the is a composition of hydrogen and Oxygen at a required  Proportion and it exists in gaseous state

aqueous magnesium sulfate

the is a composition of magnesium and Sulfur at a required Proportion and exists in aqueous

Therefore

This Separation is done by heating the Mixture to form magnesium sulfate crystals

Pressure is then applied to the magnesium sulfate crystals causing a collapse to give Reduced hydration of magnesium sulfate crystals.

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The method generally involves heating a mixture of epsomite and halite to form clusters of lower hydrated magnesium sulfate crystals and subsequently applying slight pressure to the clusters so that they collapse to yield fine, less hydrated magnesium sulfate crystals which can then be easily separated from the ...

the volume increases

what is the question here. i think you messed up.