Biodegradable DOES NOT mean harmless or safe to use. All this means is that eventually these chemical compounds will break down and will not "destroy" or have an adverse affect on nature. When using Biodegradable chemicals of any kind WEAR gloves and protect your SKIN and EYES and DO NOT BREATHE IN. Organic acids are considered Biodegradable and will still eat through your skin and bodily tissues causing irreparable damage.