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LFX31945ST07

Exact-Fit Model Guide

Water Filter for the LG LFX31945ST07 (LT700P)

Your LG refrigerator takes the LT700P slot. Below is every filter that fits — OEM and certified alternatives — with real prices.

✓ 100% compatible — no bypass plug needed

🔧 5-min push-in swap

🇺🇸 Ships from Indiana

LFX31945ST07 replacement water filter cartridge — Replacement cartridge for this model

LFX31945ST07 · Quick Facts

TYPE

refrigerator

YEARS MADE

—

FILTER LOCATION

upper rear of the fresh-food section in most French-door builds with interior dispensers

FILTER SLOT

LT700P bay

REPLACE EVERY

Every 6 months

ALSO BRANDED AS

lfx31945st

LFX31945ST07 · Quick Facts

Filter locationupper rear of the fresh-food section in most French-door builds with interior dispensers

Filter slotLT700P bay

Replace everyEvery 6 months

Also branded aslfx31945st

Typical installTwist or push — 5 minutes, no tools

Every cartridge that fits this model — pulled live from the catalogue:

✓

Verified fit for LFX31945ST07. Cross-checked against LG service documentation — this model family uses the LT700P bay with no chip or bypass restrictions.

Not your model? Check the finder →

LFX31945ST07 specifics — where the filter actually lives

The filter bay on the LFX31945ST07 upper rear of the fresh-food section in most French-door builds with interior dispensers, so expect to clear one shelf edge before you have working room. The seat combines push-fit and twist-lock: seat first, rotate second — reversing the order is the only way to fight this bay, and it will not let you.

Before you click buy, two things: flush before the first glass — new carbon beds shed fines for the first gallon or so, which is cosmetic, not contamination. Prefix literacy pays here: LG built these as French-door machines, and the filter bay inherits the geometry that implies, including where the dispenser feed runs. Suffix 07 = production revision; filtration hardware was not part of the revision cycle.

LF vs LS — what the prefix tells you

LF or LS: the badge difference that does (and does not) change the filter order. LF means French-door, LS means side-by-side. For filter shopping the distinction matters less than you would think — same line, different cabinet. read the code as 31 cu ft of capacity, which tells you the cartridge’s real workload between changes.

Swap it in 5 minutes

Installing the replacement water filter in the LFX31945ST07

Press the release (if fitted), twist the old cartridge free, and pull it from the header.
Wet the new cartridge’s o-ring with cold tap water so it seats without dragging.
Push the cartridge square onto the header, then give it the locking quarter turn.
Run two gallons through the dispenser to flush carbon fines, then hold the filter-reset control until the status light clears.

What this filter takes out of your water

Old cartridge vs new — the difference a timely swap makes

What it targets	Standard that covers it
Chlorine taste & odor	NSF/ANSI 42 — aesthetic effects
Particulates, Class I	NSF/ANSI 42 — fine sediment
Lead	NSF/ANSI 53 — health effects
Cysts (cryptosporidium, giardia)	NSF/ANSI 53 — microbial
PFOA & PFOS	NSF/ANSI 53 (P473) — varies by cartridge

Coverage above lists what the standard addresses, not a performance claim for any specific cartridge — removal claims vary by certificate, so check the NSF listing for the exact part number you are buying.

LFX31945ST07 filter questions

How do I reset the filter light on the LG LFX31945ST07?

Hold the filter-reset control a few seconds after the swap; the status light clears only with a seated cartridge, and the LFX31945ST07 manual maps the control by panel type.

Running the LFX31945ST07 with an empty filter bay — does it need a cap?

The bay self-seals: with no cartridge the LFX31945ST07 still dispenses, just unfiltered. No bypass plug exists for this line.

Are off-brand filters safe for a LG refrigerator?

Certified aftermarket cartridges are built to the same NSF test standards as the OEM part, and federal warranty law (Magnuson-Moss) protects your coverage when you use them.

Why is the OEM LT700P cartridge so much more expensive?

Part of the OEM price is the badge and the distribution chain. Certified alternatives meet the same test standards at a lower unit price, especially in multi-packs.

How often should I replace the filter in my LFX31945ST07?

Every six months or at the rated gallon capacity, whichever comes first — the LT700P class cartridges all share that service interval.

Do I need to turn off the water supply to change it?

No — the bay is designed for a live swap. Expect a small dribble, keep a towel in reach, and flush a couple of gallons through the new cartridge before the first glass.

Every filter that fits your fridge

OEM LT700P cartridge

This bay takes the OEM LT700P. ClearFit verified-fit alternatives for this exact slot are being staged — every compatible option for your fridge is one lookup away.

Check every filter that fits →