To Re-Use Heat Pack: Place the heat pad into a non stick pot of boiling water to melt the crystals back into liquid form. If you do not have a non stick pan then place a dish cloth on the bottom of the pot to prevent the pad from possibly sticking! Depending on the size fo the pad, it may take anywhere from 5 to 15 minutes to melt the crystals back to liquid form. NOTE: If the crystals are not completely melted, it will re-crystallize. You will know it is done when the liquid is completely clear. Allow unit to cool.