Which LG Refrigerator Water Filter Fits My Refrigerator?

Start with the refrigerator label

The refrigerator model is the strongest key because LG sells many French-door and side-by-side refrigerators that look related but use different consumables. Open the fresh-food doors and inspect the cabinet walls, ceiling, door frame, or model-and-serial label location shown in the manual. Copy the entire model, including every letter and suffix. A partial family such as “LFX” is not enough.

If the label is difficult to find, follow the LG model-number guide. Photograph the label so you can compare it without repeatedly moving food. Keep the serial number private; the public compatibility decision normally needs the model, not a photo of all registration data.

Next, enter that model into LG’s official filter finder. The finder currently highlights several families, including LT1000P, LT800P, LT700P, and LT120F air filters. Treat its result and the model manual as primary evidence. Marketplace compatibility lists are useful only after the manufacturer match is established.

Understand the three common LG water-filter families

LT1000P is a six-month, 200-gallon-class genuine LG filter used by many newer refrigerators. Its common product identifiers include ADQ74793501 and related current package numbers. The verified genuine Amazon product in HomeMemory is ASIN B074HLRXMP.

LT800P is another six-month, 200-gallon family, commonly associated with ADQ73613401 and related identifiers. It is not a substitute for LT1000P merely because both have similar service intervals. The verified genuine Amazon ASIN is B00X3DWMS4.

LT700P is also a six-month, 200-gallon family and is commonly identified by ADQ36006101. Its installation style can differ from other LG filters. The verified genuine Amazon ASIN is B0042ACZU2.

Use the LT1000P versus LT800P versus LT700P comparison when two names appear in search results. The comparison explains the differences; it does not replace a model lookup.

Compare the old cartridge carefully

After confirming the family from the refrigerator model, inspect the old filter label. Look for the exact LT name, ADQ number, package number, and orientation marks. A worn label may be hard to read, but a partial number can still help confirm the official result.

Do not use color, cap shape, tab position, or overall length as the only test. Counterfeit and aftermarket products often imitate those features, and neighboring genuine families can appear similar in small photos. Do not force a cartridge that does not enter and rotate normally. Return to model identification if the old label and official finder disagree.

An old filter can also be wrong. A previous owner may have installed a third-party cartridge or kept a package from another appliance. That is why the refrigerator model remains the anchor.

Choose the correct purchase path

Once the family is confirmed, use the exact replacement guide: LG LT1000P replacement, LG LT800P replacement, or LG LT700P replacement.

The genuine OEM path is the simplest compatibility baseline. An aftermarket cartridge should identify the exact family, model coverage, and independent certification scope. “Fits LG” is too broad. Read the LG OEM versus aftermarket guide before trading fit confidence for a lower price.

After ordering, save the family, purchase date, and expected change month in HomeMemory. LG commonly uses approximately six months as a replacement baseline, while actual need can arrive sooner with heavy water use, declining flow, taste changes, or a filter alert.

What to do when no match appears

Recheck characters that are easy to confuse, including zero and O or one and I. Try the base model and then the full suffix in LG’s support search. Open the official product-support page and its manual. If the refrigerator uses an external inline filter, bypass plug, or a filter system not covered by the popular families, do not select a cartridge from this three-filter list.

For a used refrigerator with no cartridge installed, the housing alone is not sufficient proof. Contact LG support with the complete model. The same rule applies when the housing is damaged or a filter has broken inside it.

Create a compatibility record, not just a shopping note

Save the complete refrigerator model, confirmed filter family, manufacturer source, verification date, and successful installation result. A record that says only “LT1000P” loses the evidence connecting the cartridge to the appliance.

Attach the receipt and note the exact ASIN after purchase. When the product arrives, compare the listing, box, and cartridge before opening the protective cap. If anything conflicts, preserve return eligibility and verify again.

After installation, record whether the cartridge locked normally, whether the 2.5-gallon flush was completed, and whether the housing remained dry. This closes the loop between online compatibility and real-world fit.

Plan for changing products and appliances

A family can remain correct while packaging, part-number suffixes, and listings change. Recheck LG’s current finder before each new product path is added to the site. Do not assume an old screenshot remains authoritative indefinitely.

If the refrigerator is replaced, archive the old profile rather than editing its model into the new appliance. The old receipts and warranty history belong to the old refrigerator. Create a fresh compatibility path for the new one.

If a household has two LG refrigerators, label them clearly and keep their filter records separate. Similar-looking cartridges stored together are a common source of wrong-family installations.

Use the first successful installation as confirmation

Manufacturer documentation makes the compatibility decision; the installation outcome completes the household record. A cartridge that enters normally, locks through the documented motion, stays dry, and supports stable post-flush flow gives useful confirmation that the recorded family is correct.

Do not reverse that logic and force a filter merely to “test” fit. When the documented family does not install normally, stop and investigate the model, packaging, product condition, and housing.

Once the result is saved, later reminders can present the same exact family with far less friction. The owner still reviews the live listing, but no longer starts from an unfiltered Amazon search.

Final Verdict

The correct LG filter begins with the refrigerator label, not an Amazon search result. Confirm the complete model through LG, verify the family against the old cartridge, and only then choose LT1000P, LT800P, or LT700P. That short compatibility gate protects the refrigerator and turns the purchase into a repeatable maintenance record.