Using the power of a live microbial formula, CLR PRO Bio-Enzymatic Drain Maintainer helps prevent the accumulation of fat, oil, and grease in grease traps and keeps your drains flowing freely. The live bacteria digest and help degrade buildup and eliminate bad odors without the use of other harmful byproducts. Emulsifier-free and won't cause drain hardening down the line. EPA's Safer Choice for safer chemistry means it is safe for all drains and traps, while the NSF registration signifies that it is approved for use in food processing, food storage, and food service facilities.