Drain cleaners don't have to be bad for the environment. Drain OUT products are designed to be powerful, effective and safer for the environment. Drain OUT drain freshener and clog preventer uses a unique liquid enzyme-based drain cleaner formula that works overnight to improve your drain by removing buildup that causes clogs and replacing bad smells with a pleasant citrus fragrance. Regular use maintains drains, prevents clogs and keeps drains open and flowing freely. Drain OUT is plumbing and septic safe.