Culligan has discontinued the
SG-2 water filter. There is no replacement. You
must purchase a new system to replace your entire system. If you are using this as a whole house filtration system, one option is the
#20 Big Blue. You can choose any of the
20" L x 4.5" W filters for the system. If you are using this as an under sink filtration system with a dedicated faucet, one option is the
Culligan US-EZ-4 filtration system. If you would like other options, please
Contact Us and we can help you find a solution.