Home › Refrigerator Water Filters › LG › LFX25978SW
Water Filter for the LG LFX25978SW (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:
✓
LFX25978SW specifics — where the filter actually lives
The filter bay on the LFX25978SW in the fresh-food compartment, typically the upper back wall in most French-door layouts, the same estate every French-door refrigerator in this family uses. The seat combines push-fit and twist-lock: the keyed entry means no cross-threading, and the locking turn is short enough to do one-handed.
The recurring owner notes: the reset control is the step everyone skips; the light will not acknowledge a new cartridge on its own. One prefix, one chassis family: the LF run is LG’s French-door series; across the run, the filter bay is one of the constants. The SW tail marks finish variants of one chassis; the filter bay is shared across the entire finish range.
LF vs LS — what the prefix tells you
Know your LF from your LS and the cartridge question halves: Chassis first: French-door (LF) versus side-by-side (LS). The shared cartridge line covers both without adaptation. the 25 cubic feet figure in the code is the household size proxy; larger households breach the rated gallons before the calendar does.
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.
LFX25978SW filter questions
How to reset the water filter indicator: LG LFX25978SW?
With the new cartridge seated, press and hold the filter reset until the light clears — panel placement differs, so the LFX25978SW manual’s filter section has the exact control for your trim.
Is a bypass plug required for the LFX25978SW when the cartridge is removed?
You can, but unfiltered — the LT700P bay needs no bypass plug; it just passes water through without filtering while the cartridge is out.
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 LFX25978SW?
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
Related guides
POPULAR GUIDE
How to change a Whirlpool refrigerator water filter
Every Filter 1–6 bay location — including the door-mounted bays on WRX models, with door-open angles and cap-release quirks. — read the guide →
POPULAR GUIDE
How to reset your Whirlpool filter light
Filter 1–6 indicator maps showing which key actually clears the light on your panel. — read the guide →
WATER PROBLEM GUIDE
Does your fridge filter remove fluoride?
What EDR1RXD1-class carbon blocks actually take out — and the systems that do remove fluoride. — read the guide →