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Water Filter for the LG LSC27921SW (LT500P)
✓ 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:
✓
LSC27921SW specifics — where the filter actually lives
Where the filter actually lives: behind the lower fresh-food trim or base grille in most side-by-side layouts, the same estate every side-by-side refrigerator in this family uses. Mechanically the LSC27921SW uses a push-and-twist cartridge: press, quarter-turn, finished — the two-step seat keeps the o-ring from dragging on installation.
Field notes: expect the first swap to take longer than the box suggests — aged o-rings grip — so budget ten minutes, not five. Decode the plate and the parts question answers itself: LG built these as side-by-side machines, and the filter bay inherits the geometry that implies, including where the dispenser feed runs. Finish codes such as SW change the look, not the plumbing — order the cartridge by model, ignore the finish letter.
LS vs LF — what the prefix tells you
Same parts shelf, two cabinet missions — Ordering by prefix works because LS means side-by-side and LF means French-door in this catalog — and the cartridge pool overlaps both. the 27 cubic feet in the code is the size class; households that size move enough water that the six-month interval is worth honoring.
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.
LSC27921SW filter questions
How to reset the water filter indicator: LG LSC27921SW?
With the new cartridge seated, press and hold the filter reset until the light clears — panel placement differs, so the LSC27921SW manual’s filter section has the exact control for your trim.
Is a bypass plug required for the LSC27921SW when the cartridge is removed?
No — run it empty if you like; the LT500P 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 LT500P 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 LSC27921SW?
Every six months or at the rated gallon capacity, whichever comes first — the LT500P 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 LT500P. 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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