Two calculators

Tools

Both run entirely in your browser, both print what they did, and both stop rather than guess when the input does not support an answer.

• Filter Finder

  A brand family, then a cartridge code, then the three-cell chip for what that code’s genuine listing names, with genuine and aftermarket listings kept apart.

  It does not guess a code from a brand, and it never fills a cell a listing left empty.

• Filter Life Check

  A stated gallon rating divided by a daily volume you supply, printed as months with the arithmetic shown line by line.

  It does not suggest how much water to drink, in any unit.

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.