Initially, Body Purifying Foot Pads should be used nightly (on one foot) for a recommended period of thirty days. Individuals who feel that they have been exposed more extensively to toxins may choose to prolong the 30 day period or use patches on both feet. After the initial cleansing period, simple maintenace is recommended (one patch every two to three weeks). To purchase the pads/refills, please see item # 15-0945 Body Purifying Foot Pads. For more information, you can reference the feature tabs on this product page.