Hydrodermabrasion is a crystal-free machine that very gently exfoliates the top layer of the skin with distilled water, water infused with vitamins or minerals or saline. When this top layer of flaky skin, dead skin cells, and grime is removed the new healthy layer of younger looking, polished skin is revealed. Though recommended for all skin types, dermabrasion with water is specifically designed for those with highly sensitive skin. 3 passes over skin with this service.