How often do I replace the filter?

Every 60 days for one person, or every 30 days if two or more people are using it. Each cartridge is good for 210 gallons.

You do not have to keep track. The display counts down as you use it, tells you to reorder at 20%, and reads "chg" when the cartridge is spent.

You choose the 30 or 60 day schedule when you subscribe and you can change it any time at thecoldlife.com/tools/recurring/login