Fridge water filter guides
Last checked October 28, 2026
Where is the model number on my refrigerator?
Where each fridge brand puts the model number tag, from the makers' own help pages, and how to read it so you get the right filter.
Genuine vs replacement fridge filters: what actually differs
Genuine and replacement fridge filters compared on what you can check: certification listings, rated capacity and fit. With real examples from our 2026 data.
How to read an NSF listing for a fridge filter
Read an NSF drinking water treatment listing in a minute: brand and model, replacement element, rated gallons, flow rate and claims. Real example inside.
NSF 42 vs 53 vs 401 for fridge filters
NSF/ANSI 42 covers taste and chlorine, 53 covers health claims such as lead, 401 covers emerging compounds. What each means when you buy a fridge filter.
How to check if a fridge filter is really certified
Check any fridge filter yourself in 3 public databases in about a minute: NSF, IAPMO R&T and WQA. What counts and what does not.
How often to change a fridge water filter
How often to change your refrigerator water filter, by the maker's own interval and rated gallons, for the most common genuine filters.