Zep Crystal Drain Defense Drain Cleaner, 18 oz. is an enzymatic drain cleaner designed to effectively end slow drains and prevent clogs by cleaning and removing build-up inside your pipes. This product is safe for all types of pipes and septic systems, making it a reliable choice for maintaining your plumbing. Environmentally safe and USDA , it a natural solution to keep your drains flowing smoothly. Regular use ensures that your pipes remain clean and of blockages. The convenient jar provides 50 treatments, making it an economical and practical option for ongoing drain maintenance. Model Number: ZDC16