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Water Filter for the LG LMX28988SB (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:
✓
LMX28988SB specifics — where the filter actually lives
On the LMX28988SB, the cartridge inside the fresh-food cavity, position varying with dispenser spec, a spot that survives trim changes across the LM run. This is a push-twist style bay: the short locking turn after the press is what keeps the seal honest between changes.
Before you click buy, two things: expect the first swap to take longer than the box suggests — aged o-rings grip — so budget ten minutes, not five. Prefix literacy pays here: LM marks the 4-door Max line in LG’s catalog, so cross-referencing cartridges by chassis rather than by door style keeps you out of the wrong-parts queue. Trim code SB: cosmetic variants of one chassis, one cartridge family.
LM vs LF — what the prefix tells you
Know your LM from your LF and the cartridge question halves: LM machines are 4-door Max; LF machines are French-door. Both draw from the same cartridge line, which is why fit charts list them together. The two digits after the letters are the cabinet size: this is a 28 cu ft refrigerator, which sets how much dispenser work the cartridge does between changes.
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.
LMX28988SB filter questions
LMX28988SB filter light will not turn off — what is the reset step?
Hold the filter-reset control a few seconds after seating the new cartridge; placements vary by control panel, and the LMX28988SB manual’s filter-status page has the exact spot.
Running the LMX28988SB with an empty filter bay — does it need a cap?
The bay self-seals: with no cartridge the LMX28988SB 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 LMX28988SB?
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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