Pseudobulbs may plump up if they take up more water. If it's available they will take up as much as they need. Adding anything to the water won't make it happen to a greater extent.
Water containing dissolved minerals in a concentration higher than what is in the plant may damage roots.
Epsom salts contain magnesium, which is a mineral plants need for producing chlorophyll. If the fertilizer or water used contain magnesium, more is not needed. If magnesium is needed people use between 1/2 teaspoon and 1 Tablespoon per gallon of water, perhaps once every 3-4 weeks.
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