Refrigerator Water Filter Numbers, Explained

The box in the store says LT700P. The label on the filter you just pulled out of the fridge says AGF80300702. The receipt from the last time you ordered one says ADQ36006101. All three are the same LG filter, and LG's own product page lists six numbers for it. This is normal, and once you know how the numbers are layered it stops being confusing.

The name on the box versus the part number

Every maker gives a filter a short name for the shelf and one or more internal part numbers for the parts system. LG's page for the LT700P gives the name, then “Part No. ADQ36006101 / AGF80300702 / ADQ36006113 / ADQ36006111 / AGF80300701.” Those five are not five filters. They are the one filter as it moved through LG's catalog over the years, and any of them fits the same housing. Samsung's support site names its three current filters HAF-CIN, HAF-QIN and HAFCU1, shelf names in the same sense.

The practical rule: the name on the box is what you shop with, and any of the part numbers is what you match against the old filter. If the number on your old filter appears anywhere in the list, you have the right one.

Superseded numbers

Sometimes a maker changes the filter, not just its number. GE's XWFE replaced the XWF, and the two are only compatible in one direction. GE's support article on the XWFE says it “is backwards compatible” and can be used in refrigerators that took the XWF, but the older XWF “is not forward compatible with newer models of refrigerators using the XWFE because they are designed to have the filter interact with the control panel.”

So a superseded number is a one-way street. The new filter fits the old fridge; the old filter does not necessarily fit the new one. FilterHound records a replaced number on the newer filter's page under “Replaced by this,” so a search for the old number lands you on the filter you should buy now.

Equivalents from other brands

Beyond the maker's own numbers there are store-brand relabels and third-party equivalents, each with its own number. FilterHound lists an equivalent only when a source for it has been read, and a third-party listing appears on a page only when that brand publishes an NSF/ANSI certification for the part. That is why some pages show a long list of equivalents and some show none. An empty list means nothing verified yet, not that nothing exists.

Your fridge has numbers too, and one letter matters

The other half of the problem is the refrigerator's model number, and here a single letter can change the filter. LG's LFX28968 is a 2015 French door that takes the LT700P. LG's LFXS28968, one letter longer, is a 2017 French door that takes the LT1000P. Both facts come from LG's own spec sheets for the two models. Read the whole number off the rating label, not the first few characters.

The letter at the very end usually means something else. LG lists the LFXS30766S and LFXS30766D on one spec sheet, as the stainless and black stainless versions of the same refrigerator, and both take the same filter. FilterHound's model pages list every model number the maker's sheet covers, so you can match yours in full.

What the numbers do not tell you

A part number tells you nothing about how the filter installs or whether it will work in a fridge that expects a specific one. LG's three current filters all install with a twist and are all rated at six months or 200 gallons, and LG's spec sheets still assign each model exactly one of them. GE's XWFE and RPWFE carry an RFID tag that the refrigerator reads, and GE says a non-GE filter in an XWFE fridge puts “ERR” on the display and shuts off the water. The number gets you to the right filter. The model page tells you what that filter has to do once it is in.

How FilterHound sorts them

Every refrigerator filter page carries one table with four kinds of row. Primary is the name on the box. Same part, other number is every other number the maker uses for it. Replaced by this is a number the filter superseded. Equivalent is a relabel or a third-party filter sold to fit the same housing. Search any of them and you land on the same page.

Next: How to Find the Right Water Filter for Your Refrigerator, or start from your brand on the refrigerator filters page.