Tool
Filter Life Check
A gallon rating is a capacity, not a calendar. This turns one into the other using a daily volume you supply, and prints the arithmetic so you can check it.
Step one, what kind of filter
Step two, the rating the listing states
These are the only ratings any listing in this catalog states for this kind of filter. They are read from the data, not typed in here.
Step three, how much water goes through it in a day
The volume you enter is your own figure. This site does not tell anyone how much water to drink. Intake depends on the person, the climate and their health, and drinking too much water carries its own risks. Any volume you type into the tools on this site is your own figure.
Result
Pick a stated rating above. A rating in gallons can be turned into months; a rating already given in months cannot be improved on by arithmetic.
Every formula this tool uses
- gallons a day = liters a day ÷ 3.785
- months = stated gallons ÷ (gallons a day × 30.44)
- months = stated months, when the listing states months and no gallon figure
Manufacturers usually publish both a months figure and a gallon figure. Where both exist, replace the cartridge at whichever arrives first, not at whichever is more convenient.
Where the option buttons come from
They are the distinct ratings actually stated by listings in this catalog, read from the data rather than typed into this page. Pitcher listings state 2 distinct ratings and refrigerator cartridge listings state 2. If the rating printed on the cartridge you are holding is not on the buttons, no listing here states it.
Pitchers and dispensers
200 gallons · 2 months
Refrigerator cartridges
200 gallons · 6 months
About the number you type in
This site does not tell anyone how much water to drink. Intake depends on the person, the climate and their health, and drinking too much water carries its own risks. Any volume you type into the tools on this site is your own figure.
It is also not only drinking water. A pitcher that fills a kettle, a pot and a dog bowl is passing more through the cartridge than one that fills a glass, and the cartridge does not care which it was. Estimate the throughput, not the intake.
The companion tool is Filter Finder. The standards behind these ratings are at Standards.