$200 discount when you trade in and upgrade to a new Culligan system September 16, 2020 by Get up to a $200 discount when you trade in and upgrade to a new Culligan system. Category: Water Treatment Solutions Description Description Get up to a $200 discount when you trade in and upgrade to a new Culligan system. Related products Select optionsMedalist Filters $65.00 Add to cartReverse Osmosis System & a Water Softener for only $39.95 a month $39.95 Add to cartWhole-House Systems Starting At $9.95 per month $9.95 Add to cartAC-30 Reverse Osmosis System $13.00