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Water Filter for the LG LFX28991ST (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:
✓
LFX28991ST specifics — where the filter actually lives
Where the filter actually lives: inside the fresh-food cavity, upper zone in most French-door builds, a spot that survives trim changes across the LF run. The seat combines push-fit and twist-lock: seat the cartridge, give it the quarter turn, and the bay takes it from there.
The recurring owner 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: when LG stamps LF on the plate it is sorting the machine into the French-door class — same water path, same cartridge, different cabinet. The ST ending is a finish code — color and handle options, not mechanical ones. Every finish of this chassis takes the same cartridge.
LF vs LS — what the prefix tells you
The catalog pairs LF with LS, and the split matters at order time: The door count differs — French-door against side-by-side — but the bay and the cartridge order do not. Capacity check: the 28 cubic feet in the code is the box size, and bigger boxes push more water through the same cartridge between swaps.
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.
LFX28991ST filter questions
Clearing the filter status light on a LG LFX28991ST?
Press and hold the reset control until the light clears (a few seconds), with the new cartridge already seated — the LFX28991ST owner’s manual lists the button location for your control panel.
Is a bypass plug required for the LFX28991ST 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 LFX28991ST?
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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