Thank you for reaching out about your experience with Drano® Max Ultra Gel. After two uses, Drano® should clear out your drain. If you’re still experiencing a slow-running or clogged drain, it's possible the clog is further down the pipes than Drano® can reach. So we can learn more about what may have happened, please give us a call at 1-800-558-5252 (Monday through Friday 8 AM to 5 PM CT). Your reference number is 020916120A. We look forward to hearing from you! – Rachel, SC Johnson Consumer Care