Check the labels on chemically based drain cleaners & you will see words such as: caution, warning, hazard, or precautionary statements - hazardous to humans and domestic animals. Bio-Clean is harmless to people and all types of plumbing and is not required to have warning labels.
You can link below to MSDS (material safety data sheet) sheets on Bio-Clean. Bio-Clean is authorized by the U.S.D.A. for use in federally inspected meat and poultry plants.
Click filename below to access file
The above publications are in pdf format, link here to download Acrobat Reader free