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Water Filter for the LG LFX28978SB (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:
✓
LFX28978SB specifics — where the filter actually lives
The filter bay on the LFX28978SB high on the fresh-food side in most French-door layouts — upper back or left wall, a deliberate placement that keeps the swap away from the door seals and drawer rails. The seat combines push-fit and twist-lock: the short locking turn after the press is what keeps the seal honest between changes.
Field notes: the line is still live when you open the bay, so keep a towel in reach, and expect the filter-status light to need a reset before it believes the new cartridge. 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. Finish codes such as SB change the look, not the plumbing — order the cartridge by model, ignore the finish letter.
LF vs LS — what the prefix tells you
Prefix families here: LF against LS. French-door on the LF side, side-by-side on the LS side — the parts catalog runs the same cartridge across both. cabinet class 28 cu ft — 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.
LFX28978SB filter questions
Reset procedure for the change-filter alert on the LFX28978SB?
The reset is a press-and-hold on the filter control with the cartridge in place; check the LFX28978SB owner’s manual for where that control sits on your panel.
Does the LG LFX28978SB need a bypass plug when the filter is out?
No — run it empty if you like; the LT700P bay needs no bypass plug, it simply passes water through untreated.
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 LFX28978SB?
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
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 →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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