plumbing question

Are enzyme drain cleaners like Drain Care truly safe for plumbing? This is the only type of drain cleaner I would even consider using (other than a snake).
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.