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Water Filter for the LG LMXS30776S (LT800P)
✓ 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:
✓
LMXS30776S specifics — where the filter actually lives
Where the filter actually lives: in the fresh-food compartment — exact spot varies by dispenser layout, so expect to clear one shelf edge before you have working room. Mechanically the LMXS30776S uses a push-and-twist cartridge: the cartridge goes in square, then a short rotation locks it against the header — no tools involved.
Two quirks worth knowing before you order: plan on a towel for the first pull — sitting water in the line — and a five-second reset hold once the fresh cartridge is in. The LM in LMXS30776S is doing real work: when LG stamps LM on the plate it is sorting the machine into the 4-door Max class — same water path, same cartridge, different cabinet. 6S is finish coding: handles, colors, panel options — none of it reaches the filter bay.
LM vs LF — what the prefix tells you
Catalog shorthand: Chassis first: 4-door Max (LM) versus French-door (LF). The shared cartridge line covers both without adaptation. capacity 30 cubic feet: a mid-to-full-size cabinet whose dispenser traffic sets the realistic change cadence.
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.
LMXS30776S filter questions
How to reset the water filter indicator: LG LMXS30776S?
Lock in the new cartridge first, then hold the reset control for a few seconds — the LMXS30776S manual documents the button for each panel variant.
Does the LG LMXS30776S need a bypass plug when the filter is out?
Nothing to buy — the LT800P housing closes without a cartridge; water runs unfiltered until the next one goes in.
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 LT800P 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 LMXS30776S?
Every six months or at the rated gallon capacity, whichever comes first — the LT800P 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 LT800P. 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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