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Water Filter for the LG LFX28978SW (LT700P)
✓ 100% compatible — no bypass plug needed
🔧 5-min push-in swap
🇺🇸 Ships from Indiana
Every cartridge that fits this model — pulled live from the catalogue:
✓
LFX28978SW specifics — where the filter actually lives
Where the filter actually lives: in the fresh-food compartment, typically the upper back wall in most French-door layouts — usually a kneeling-height or shoulder-height swap, not a teardown. This is a push-twist style bay: two motions, one orientation, five minutes including the cleanup.
Two quirks worth knowing before you order: expect the first swap to take longer than the box suggests — aged o-rings grip — so budget ten minutes, not five. The LF prefix is the tell: LF marks the French-door line in LG’s catalog, so cross-referencing cartridges by chassis rather than by door style keeps you out of the wrong-parts queue. Finish letter sets like SW never alter the bay; the LT700P line fits the whole set.
LF vs LS — what the prefix tells you
The LF/LS pair divides this family by layout — Chassis first: French-door (LF) versus side-by-side (LS). The shared cartridge line covers both without adaptation. cabinet class 28 cubic feet — a box that size leans on the dispenser, so the six-month cartridge interval earns its keep.
Swap it in 5 minutes
- 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
| 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.
LFX28978SW filter questions
LG LFX28978SW: how do I clear the change-filter light?
With the new cartridge seated, press and hold the filter reset until the light clears — panel placement differs, so the LFX28978SW manual’s filter section has the exact control for your trim.
Will the LG LFX28978SW dispense water without a filter cartridge?
The bay self-seals: with no cartridge the LFX28978SW 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 LFX28978SW?
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
| Cartridge | OEM LT700P | RECOMMENDEDLT700P Replacement Water Filter · 1-Pack – ClearFit |
|---|---|---|
| Price | OEM list | $15.49 |
| Verified fit | ✓ the bay cartridge | View & buy → |
This filter expires six months from today
Your HVAC filter is probably on a different cycle. Track them all in one place.
months until this filter should be replaced (200-gal rated life)
Free tool · tracks fridge + HVAC + whole-house · auto-refill optional
More models using this filter
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