Since a site inspection and water test is required, Culligan Water Softener installation is a little different than buying a softener online and asking a plumber to install it. This work on the front end helps mitigate issues down the road. The installation process usually only takes a day or two depending on work needing done on drain lines, your water supply, and electrical connections. Your Culligan expert will always test the softener after installation to ensure it is working properly.