"No biocides" means nothing has been added to kill microorganisms. Many biocides commonly used are bothersome to sensitive people, so they routinely avoid all of them, as do many other individuals wanting to live an eco-conscious, chemical-free life.
Keep in mind, however, that if you use a product such as biocide-free wallpaper paste or bathtub caulking, you risk unwanted fungal or bacterial growth. Therefore, some products using less-toxic biocides can be better choices than biocide-free versions.
