Bio-5 Drain Cleaner by BASF is a multipurpose biological drain cleaner used for drain flies that breed in the organic material along the sides of drains. Bio-5 improves drain flow, eliminates drain and system odors, reduces food sources and breeding sites for drain pests, and eliminates odor-attraction for drain pests. Specialized microbes provide rapid digestion of organic harborages. Safe for plumbing, long shelf life (2-4 years), biodegradable, salmonella-free.