Changeland and Salt Caves have been certified by TÜV Nord (the German international certification) on ISO 9001 (Quality) and ISO 14001 (Environment).  
 
iso 14000TUV iso 9001
Changeland is the only company that has received these certifications to the processes (a) Management salt cave and (b) Installation of a salt cave.

 Here are the ISO certificates.

ISO Certificate_9001

ISO CERTIFICATE_14000_CHANGELAND