This is again using electrics in the treatment room. Desincrustation will deep cleanse and remove oil while Iontophoresis is a means to introduce water molecules substances into the skin for specific purposes. Would you love to learn more about the anode/cathode, anions, cations situation? Too nerdy?!
The benefit of using such machinery is to allow a deeper penetration of active ingredients into the lower layer, eg Vitamin A, Retinol etc. Remember the skin is not designed to allow products to penetrate so we must find alternative ways to facilitate penetration.