Contact

What is genuinely useful to send

• A listing whose certification wording has changed, with a link. This site records what a listing said, so a changed listing makes a page wrong.
• A cartridge code with an aftermarket listing that states it, where this site currently says none exists in the catalog.
• A place where a claim reads as a fact rather than as something a seller wrote. That is the failure mode this site cares most about.
• A broken source link, or one that has moved.

What this address cannot help with

Anything about your own water supply, your own health, or whether a filter is right for a situation you are worried about. Those go to your utility, your local health department and a clinician. The starting points are below.

• EPA: ground water and drinking water
• EPA: Consumer Confidence Reports
• CDC: drinking water