We will contact you by e-mail before your supply runs out to inquire if you wish us to ship you a refill. For customers without e-mail access, we offer an automated refill reminder telephone service. This service will call you at least three weeks in advance to remind you to order your refill. All refills may be ordered simply by calling our toll-free customer service number at 1-866-530-2794 or emailing us at refills@tcds.com.