LG LT1000P Refrigerator Water Filter

Don't know your code? It is printed on the old cartridge and usually on a label inside the filter compartment. Match that code to the codes above — this page covers only the cartridge named in its title.

Remind me in 6 months — a calendar file for the replacement date; no email address is collected.

Is LT1000P NSF/ANSI 42 certified?

Certification answer: no live certifier listing was located for the genuine LT1000P; its NSF/ANSI 42, NSF/ANSI 53, NSF/ANSI 401, NSF/ANSI/CAN 372 claims rest on the documents labeled below, not a certifier listing. The full certification record, with each claim labeled by the strength of its evidence, follows.

Certifications — documents and listings

• NSF/ANSI 42 — stated by LG; this link is the manufacturer's own page, not a certifier listing.Manufacturer's statement
• NSF/ANSI 53 — stated by LG; this link is the manufacturer's own page, not a certifier listing.Manufacturer's statement
• NSF/ANSI 401 — stated by LG; this link is the manufacturer's own page, not a certifier listing.Manufacturer's statement
• NSF/ANSI/CAN 372 — stated by LG; this link is the manufacturer's own page, not a certifier listing.Manufacturer's statement

A certification counts as listed here only when a certifier's listing names this cartridge or its system. Anything else is labeled above as what it is — a manufacturer's statement or a reproduction. See how to check a cartridge in the NSF listing.

What does LT1000P fit?

LG refrigerators that take LT1000P / LT1000PC / LT1000PCS; LG French-door and Side-by-Side models using system MDJ64844601. Match the code on your old cartridge or the label inside the filter compartment — this page covers only the cartridge named in its title.

Verdict

Bottom line: LG's own document states the LT1000P is tested and certified by NSF International against NSF/ANSI 42, 53 and 401, but no certifier listing is linked here — check any cartridge, genuine or third-party, in the certifier's listing under its own code before you buy it.

LG's own filter guide is unusually explicit: it lists system MDJ64844601 as tested and certified by NSF International against NSF/ANSI 42, 53 and 401 and NSF/ANSI/CAN 372, with the reduction claims broken out by standard. LG's product page repeats the same three standards and the 6-month / 200-gallon replacement rule.

What's wrong with LT1000P?

The drawback: Capacity is 200 gallons at 0.5 gpm, and LG requires dispensing 2.5 gallons to flush a new cartridge before use — water and time spent before the first clean glass. Heavy water or ice use will hit the gallon limit well before the 6-month date.

Genuine vs third-party notes

LG prints how to spot a genuine cartridge on its own page: check for the LG logo under a light and the genuine hologram label on the package. A third-party LT1000P cartridge should be checked in the certifier listing under its own system or element code, not LG's MDJ64844601.

No specific third-party cartridge has been checked for this page yet. When one is, it will be named here with its own listing check and a dated price.

History

• First published: 2026-11-05.
• Last verified: 2026-11-06.
• 2026-11-05 — LG LT1000P: capacity comparison removed: The verdict said this cartridge's 200-gallon capacity was the joint-lowest of the four cartridges checked at launch. That was wrong: the GE XWFE is rated at 170 gallons. The comparison has been removed; the verdict now states the capacity, and the 2.5-gallon flush a new cartridge needs before first use, on their own.

Sources

• LG LT1000P water filter guide / performance data — system MDJ64844601, NSF/ANSI 42, 53, 401 and 372, capacity 200 gallons, flow 0.5 gpm
• LG product page — LT1000P (AGF80300704), tested and certified by NSF International against NSF/ANSI 42, 53, 401, replace every 6 months or 200 gallons, flush 2.5 gallons